]> git.wh0rd.org - tt-rss.git/blobdiff - prefs.js
prefs: some async work (6)
[tt-rss.git] / prefs.js
index 8fdaeb94037d0579c69cef8636e4e645d709ba3f..813d8df689b62179a22f7bb22ba8669eca7df5e3 100644 (file)
--- a/prefs.js
+++ b/prefs.js
@@ -1,10 +1,5 @@
-var xmlhttp = false;
-
 var active_feed_cat = false;
 var active_tab = false;
-var feed_to_expand = false;
-
-var xmlhttp = Ajax.getTransport();
 
 var init_params = new Array();
 
@@ -12,94 +7,37 @@ var caller_subop = false;
 var sanity_check_done = false;
 var hotkey_prefix = false;
 
-function infobox_callback() {
-       if (xmlhttp.readyState == 4) {
-               infobox_callback2(xmlhttp);
-       }
-}
-
-function infobox_submit_callback() {
-       if (xmlhttp.readyState == 4) {
-               infobox_submit_callback2(xmlhttp);
-       }
-}
-
-
-function replace_pubkey_callback() {
-       if (xmlhttp.readyState == 4) {
-               try {   
-                       var link = document.getElementById("pubGenAddress");
-
-                       if (xmlhttp.responseXML) {
+function replace_pubkey_callback(transport) {
+       try {   
+               var link = document.getElementById("pubGenAddress");
 
-                               var new_link = xmlhttp.responseXML.getElementsByTagName("link")[0];
+               if (transport.responseXML) {
 
-                               if (new_link) {
-                                       link.href = new_link.firstChild.nodeValue;
-                                       //link.innerHTML = new_link.firstChild.nodeValue;
+                       var new_link = transport.responseXML.getElementsByTagName("link")[0];
 
-                                       new Effect.Highlight(link);
+                       if (new_link) {
+                               link.href = new_link.firstChild.nodeValue;
+                               //link.innerHTML = new_link.firstChild.nodeValue;
 
-                                       notify_info("Published feed URL changed.");
-                               } else {
-                                       notify_error("Could not change feed URL.");
-                               }
+                               new Effect.Highlight(link);
 
+                               notify_info("Published feed URL changed.");
                        } else {
                                notify_error("Could not change feed URL.");
                        }
-               } catch (e) {
-                       exception_error("replace_pubkey_callback", e);
-               }
-       }
-}
-
-function expand_feed_callback() {
-       if (xmlhttp.readyState == 4) {
-               try {   
-                       var container = document.getElementById("BRDET-" + feed_to_expand);     
-                       container.innerHTML=xmlhttp.responseText;
-//                     container.style.display = "block";
-                       Effect.Appear(container, {duration : 0.5});
-                       notify('');
-               } catch (e) {
-                       exception_error("expand_feed_callback", e);
-               }
-       }
-}
-
-function feedlist_callback() {
-       if (xmlhttp.readyState == 4) {
-               try {   
-                       var container = document.getElementById('prefContent'); 
-                       container.innerHTML=xmlhttp.responseText;
-                       selectTab("feedConfig", true);
-
-                       if (caller_subop) {
-                               var tuple = caller_subop.split(":");
-                               if (tuple[0] == 'editFeed') {
-                                       window.setTimeout('editFeed('+tuple[1]+')', 100);
-                               }                               
 
-                               caller_subop = false;
-                       }
-                       if (typeof correctPNG != 'undefined') {
-                               correctPNG();
-                       }
-                       notify("");
-                       remove_splash();
-
-               } catch (e) {
-                       exception_error("feedlist_callback", e);
+               } else {
+                       notify_error("Could not change feed URL.");
                }
+       } catch (e) {
+               exception_error("replace_pubkey_callback", e);
        }
 }
 
-/* stub for subscription dialog */
+function feedlist_callback2(transport) {
 
-function dlg_frefresh_callback(transport) {
+       try {   
 
-       try {
                var container = document.getElementById('prefContent'); 
                container.innerHTML=transport.responseText;
                selectTab("feedConfig", true);
@@ -116,32 +54,36 @@ function dlg_frefresh_callback(transport) {
                        correctPNG();
                }
                notify("");
+               remove_splash();
+
        } catch (e) {
-               exception_error("feedlist_callback", e);
+               exception_error("feedlist_callback2", e);
        }
+}
+
+/* stub for subscription dialog */
 
+function dlg_frefresh_callback(transport) {
+       return feedlist_callback2(transport);
 }
 
-function filterlist_callback() {
+function filterlist_callback2(transport) {
        var container = document.getElementById('prefContent');
-       if (xmlhttp.readyState == 4) {
-               container.innerHTML=xmlhttp.responseText;
-               if (typeof correctPNG != 'undefined') {
-                       correctPNG();
-               }
-               notify("");
-               remove_splash();
+       container.innerHTML=transport.responseText;
+       if (typeof correctPNG != 'undefined') {
+               correctPNG();
        }
+       notify("");
+       remove_splash();
 }
 
-function labellist_callback() {
+function labellist_callback2(transport) {
 
        try {
 
                var container = document.getElementById('prefContent');
-               if (xmlhttp.readyState == 4) {
                        closeInfoBox();
-                       container.innerHTML=xmlhttp.responseText;
+                       container.innerHTML=transport.responseText;
        
                        if (document.getElementById("prefLabelList")) {
                                var elems = document.getElementById("prefLabelList").getElementsByTagName("SPAN");
@@ -162,81 +104,65 @@ function labellist_callback() {
                        }
                        notify("");
                        remove_splash();
-               }
 
        } catch (e) {
-               exception_error("labellist_callback", e);
-       }
-}
-
-function feed_browser_callback() {
-       var container = document.getElementById('prefContent');
-       if (xmlhttp.readyState == 4) {
-               container.innerHTML=xmlhttp.responseText;
-               notify("");
-               remove_splash();
+               exception_error("labellist_callback2", e);
        }
 }
 
-function userlist_callback() {
-       var container = document.getElementById('prefContent');
-       if (xmlhttp.readyState == 4) {
-               container.innerHTML=xmlhttp.responseText;
-               notify("");
-               remove_splash();
+function userlist_callback2(transport) {
+       try {
+               var container = document.getElementById('prefContent');
+               if (transport.readyState == 4) {
+                       container.innerHTML=transport.responseText;
+                       notify("");
+                       remove_splash();
+               }
+       } catch (e) {
+               exception_error("userlist_callback2", e);
        }
 }
 
-function prefslist_callback() {
-       var container = document.getElementById('prefContent');
-       if (xmlhttp.readyState == 4) {
-               container.innerHTML=xmlhttp.responseText;
+function prefslist_callback2(transport) {
+       try {
+               var container = document.getElementById('prefContent');
+               container.innerHTML=transport.responseText;
                notify("");
                remove_splash();
+       } catch (e) {
+               exception_error("prefslist_callback2", e);
        }
 }
 
-function gethelp_callback() {
-       var container = document.getElementById('prefHelpBox');
-       if (xmlhttp.readyState == 4) {
-
-               container.innerHTML = xmlhttp.responseText;
-               container.style.display = "block";
-
-       }
-}
-
-function notify_callback() {
-       if (xmlhttp.readyState == 4) {
-               notify_info(xmlhttp.responseText);
-       } 
+function notify_callback2(transport) {
+       notify_info(transport.responseText);     
 }
 
-function prefs_reset_callback() {
-       if (xmlhttp.readyState == 4) {
-               notify_info(xmlhttp.responseText);
+function prefs_reset_callback2(transport) {
+       try {
+               notify_info(transport.responseText);
                selectTab();
-       } 
+       } catch (e) {
+               exception_error("prefs_reset_callback2", e);
+       }
 }
 
 
-function changepass_callback() {
+function changepass_callback2(transport) {
        try {
-               if (xmlhttp.readyState == 4) {
        
-                       if (xmlhttp.responseText.indexOf("ERROR: ") == 0) {
-                               notify_error(xmlhttp.responseText.replace("ERROR: ", ""));
+                       if (transport.responseText.indexOf("ERROR: ") == 0) {
+                               notify_error(transport.responseText.replace("ERROR: ", ""));
                        } else {
-                               notify_info(xmlhttp.responseText);
+                               notify_info(transport.responseText);
                                var warn = document.getElementById("default_pass_warning");
                                if (warn) warn.style.display = "none";
                        }
        
                        document.forms['change_pass_form'].reset();
 
-               } 
        } catch (e) {
-               exception_error("changepass_callback", e);
+               exception_error("changepass_callback2", e);
        }
 }
 
@@ -260,25 +186,18 @@ function init_cat_inline_editor() {
        }
 }
 
-function infobox_feed_cat_callback() {
-       if (xmlhttp.readyState == 4) {
-               try {
-
-                       infobox_callback();
-                       init_cat_inline_editor();
-
-               } catch (e) {
-                       exception_error("infobox_feed_cat_callback", e);
-               }
+function infobox_feed_cat_callback2(transport) {
+       try {
+               infobox_callback2(transport);
+               init_cat_inline_editor();
+       } catch (e) {
+               exception_error("infobox_feed_cat_callback2", e);
        }
 }
 
 function updateFeedList(sort_key) {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
+       try {
 
        var feed_search = document.getElementById("feed_search");
        var search = "";
@@ -291,62 +210,67 @@ function updateFeedList(sort_key) {
                slat_checked = slat.checked;
        }
 
-       xmlhttp.open("GET", "backend.php?op=pref-feeds" +
+       var query = "backend.php?op=pref-feeds" +
                "&sort=" + param_escape(sort_key) + 
                "&slat=" + param_escape(slat_checked) +
-               "&search=" + param_escape(search), true);
-       xmlhttp.onreadystatechange=feedlist_callback;
-       xmlhttp.send(null);
+               "&search=" + param_escape(search);
 
+       new Ajax.Request(query, {
+               onComplete: function(transport) { 
+                       feedlist_callback2(transport); 
+               } });
+       } catch (e) {
+               exception_error("updateFeedList", e);
+       }
 }
 
 function updateUsersList(sort_key) {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
-       var user_search = document.getElementById("user_search");
-       var search = "";
-       if (user_search) { search = user_search.value; }
+       try {
 
-       xmlhttp.open("GET", "backend.php?op=pref-users&sort="
-               + param_escape(sort_key) +
-               "&search=" + param_escape(search), true);
-       xmlhttp.onreadystatechange=userlist_callback;
-       xmlhttp.send(null);
+               var user_search = document.getElementById("user_search");
+               var search = "";
+               if (user_search) { search = user_search.value; }
+       
+               var query = "backend.php?op=pref-users&sort="
+                       + param_escape(sort_key) +
+                       "&search=" + param_escape(search);
+       
+               new Ajax.Request(query, {
+                       onComplete: function(transport) { 
+                               userlist_callback2(transport); 
+                       } });
 
+       } catch (e) {
+               exception_error("updateUsersList", e);
+       }
 }
 
 function addLabel() {
 
        try {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
-       var caption = prompt(__("Please enter label caption:"), "");
-
-       if (caption == null) { 
-               return false;
-       }
-
-       if (caption == "") {
-               alert(__("Can't create label: missing caption."));
-               return false;
-       }
-
-       // we can be called from some other tab
-       active_tab = "labelConfig";
-
-       var query = "caption=" + param_escape(caption);
-
-       xmlhttp.open("GET", "backend.php?op=pref-labels&subop=add&" + query, true);                     
-       xmlhttp.onreadystatechange=infobox_submit_callback;
-       xmlhttp.send(null);
+               var caption = prompt(__("Please enter label caption:"), "");
+       
+               if (caption == null) { 
+                       return false;
+               }
+       
+               if (caption == "") {
+                       alert(__("Can't create label: missing caption."));
+                       return false;
+               }
+       
+               // we can be called from some other tab
+               active_tab = "labelConfig";
+       
+               query = "backend.php?op=pref-labels&subop=add&caption=" + 
+                       param_escape(caption);
+       
+               new Ajax.Request(query, {
+                       onComplete: function(transport) {
+                                       infobox_submit_callback2(transport);
+                               } });
 
        } catch (e) {
                exception_error("addLabel", e);
@@ -355,38 +279,37 @@ function addLabel() {
 
 function addFeed() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
-       var link = document.getElementById("fadd_link");
-
-       if (link.value.length == 0) {
-               alert(__("Error: No feed URL given."));
-       } else if (!isValidURL(link.value)) {
-               alert(__("Error: Invalid feed URL."));
-       } else {
-               notify_progress("Adding feed...");
-
-               xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=add&from=tt-rss&feed_url=" +
-                       param_escape(link.value), true);
-               xmlhttp.onreadystatechange=feedlist_callback;
-               xmlhttp.send(null);
+       try {
 
-               link.value = "";
+               var link = document.getElementById("fadd_link");
+       
+               if (link.value.length == 0) {
+                       alert(__("Error: No feed URL given."));
+               } else if (!isValidURL(link.value)) {
+                       alert(__("Error: Invalid feed URL."));
+               } else {
+                       notify_progress("Adding feed...");
+       
+                       var query = "backend.php?op=pref-feeds&subop=add&from=tt-rss&feed_url=" +
+                               param_escape(link.value);
+       
+                       new Ajax.Request(query, {
+                               onComplete: function(transport) {
+                                               feedlist_callback2(transport);
+                                       } });
+       
+                       link.value = "";
+       
+               }
 
+       } catch (e) {
+               exception_error("addFeed", e);
        }
 
 }
 
 function addFeedCat() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
        var cat = document.getElementById("fadd_cat");
 
        if (cat.value.length == 0) {
@@ -394,10 +317,13 @@ function addFeedCat() {
        } else {
                notify_progress("Adding feed category...");
 
-               xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=editCats&action=add&cat=" +
-                       param_escape(cat.value), true);
-               xmlhttp.onreadystatechange=infobox_feed_cat_callback;
-               xmlhttp.send(null);
+               var query = "backend.php?op=pref-feeds&subop=editCats&action=add&cat=" +
+                       param_escape(cat.value);
+
+               new Ajax.Request(query, {
+                       onComplete: function(transport) {
+                                       infobox_feed_cat_callback2(transport);
+                               } });
 
                link.value = "";
 
@@ -406,128 +332,108 @@ function addFeedCat() {
 }
 function addUser() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
-       var sqlexp = document.getElementById("uadd_box");
-
-       if (sqlexp.value.length == 0) {
-               alert(__("Can't add user: no login specified."));
-       } else {
-               notify_progress("Adding user...");
+       try {
 
-               xmlhttp.open("GET", "backend.php?op=pref-users&subop=add&login=" +
-                       param_escape(sqlexp.value), true);                      
-                       
-               xmlhttp.onreadystatechange=userlist_callback;
-               xmlhttp.send(null);
+               var sqlexp = document.getElementById("uadd_box");
+       
+               if (sqlexp.value.length == 0) {
+                       alert(__("Can't add user: no login specified."));
+               } else {
+                       notify_progress("Adding user...");
+       
+                       var query = "backend.php?op=pref-users&subop=add&login=" +
+                               param_escape(sqlexp.value);
+                               
+                       new Ajax.Request(query, {
+                               onComplete: function(transport) { 
+                                       userlist_callback2(transport); 
+                               } });
+       
+                       sqlexp.value = "";
+               }
 
-               sqlexp.value = "";
+       } catch (e) {
+               exception_error("addUser", e);
        }
-
 }
 
 function editUser(id) {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
+       try {
 
-       disableHotkeys();
+               disableHotkeys();
 
-       notify_progress("Loading, please wait...");
+               notify_progress("Loading, please wait...");
 
-       selectTableRowsByIdPrefix('prefUserList', 'UMRR-', 'UMCHK-', false);
-       selectTableRowById('UMRR-'+id, 'UMCHK-'+id, true);
+               selectTableRowsByIdPrefix('prefUserList', 'UMRR-', 'UMCHK-', false);
+               selectTableRowById('UMRR-'+id, 'UMCHK-'+id, true);
 
-       disableContainerChildren("userOpToolbar", false);
+               disableContainerChildren("userOpToolbar", false);
 
-       xmlhttp.open("GET", "backend.php?op=pref-users&subop=edit&id=" +
-               param_escape(id), true);
-       xmlhttp.onreadystatechange=infobox_callback;
-       xmlhttp.send(null);
+               var query = "backend.php?op=pref-users&subop=edit&id=" +
+                       param_escape(id);
 
+               new Ajax.Request(query, {
+                       onComplete: function(transport) {
+                                       infobox_callback2(transport);
+                               } });
+
+       } catch (e) {
+               exception_error("editUser", e);
+       }
+               
 }
 
 function editFilter(id) {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
+       try {
 
-       disableHotkeys();
+               disableHotkeys();
 
-       notify_progress("Loading, please wait...");
+               notify_progress("Loading, please wait...");
 
-//     document.getElementById("create_filter_btn").disabled = true;
+               disableContainerChildren("filterOpToolbar", false);
 
-       disableContainerChildren("filterOpToolbar", false);
+               selectTableRowsByIdPrefix('prefFilterList', 'FILRR-', 'FICHK-', false);
+               selectTableRowById('FILRR-'+id, 'FICHK-'+id, true);
 
-       selectTableRowsByIdPrefix('prefFilterList', 'FILRR-', 'FICHK-', false);
-       selectTableRowById('FILRR-'+id, 'FICHK-'+id, true);
+               var query = "backend.php?op=pref-filters&subop=edit&id=" + 
+                       param_escape(id);
 
-       xmlhttp.open("GET", "backend.php?op=pref-filters&subop=edit&id=" + param_escape(id), true);
-       xmlhttp.onreadystatechange=infobox_callback;
-       xmlhttp.send(null);
+               new Ajax.Request(query, {
+                       onComplete: function(transport) {
+                                       infobox_callback2(transport);
+                               } });
+       } catch (e) {
+               exception_error("editFilter", e);
+       }
 }
 
 function editFeed(feed) {
 
-//     notify("Editing feed...");
-
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
-       disableHotkeys();
-
-       notify_progress("Loading, please wait...");
-
-/*     document.getElementById("subscribe_to_feed_btn").disabled = true;
-
        try {
-               document.getElementById("top25_feeds_btn").disabled = true;
-       } catch (e) {
-               // this button is not always available, no-op if not found
-       } */
-
-       // clean selection from all rows & select row being edited
-       selectTableRowsByIdPrefix('prefFeedList', 'FEEDR-', 'FRCHK-', false);
-       selectTableRowById('FEEDR-'+feed, 'FRCHK-'+feed, true);
-
-       disableContainerChildren("feedOpToolbar", false);
-
-       xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=editfeed&id=" +
-               param_escape(feed), true);
-
-       xmlhttp.onreadystatechange=infobox_callback;
-       xmlhttp.send(null);
 
-}
-
-function editFeedCat(cat) {
+               disableHotkeys();
+       
+               notify_progress("Loading, please wait...");
+       
+               // clean selection from all rows & select row being edited
+               selectTableRowsByIdPrefix('prefFeedList', 'FEEDR-', 'FRCHK-', false);
+               selectTableRowById('FEEDR-'+feed, 'FRCHK-'+feed, true);
+       
+               disableContainerChildren("feedOpToolbar", false);
+       
+               var query = "backend.php?op=pref-feeds&subop=editfeed&id=" +
+                       param_escape(feed);
+       
+               new Ajax.Request(query, {
+                       onComplete: function(transport) {
+                                       infobox_callback2(transport);
+                               } });
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
+       } catch (e) {
+               exception_error("editFeed", e);
        }
-
-       disableHotkeys();
-
-       notify_progress("Loading, please wait...");
-
-       active_feed_cat = cat;
-
-       xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=editCats&action=edit&id=" +
-               param_escape(cat), true);
-       xmlhttp.onreadystatechange=infobox_callback;
-       xmlhttp.send(null);
-
 }
 
 function getSelectedLabels() {
@@ -553,11 +459,6 @@ function getSelectedFeedCats() {
 
 function removeSelectedLabels() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
        var sel_rows = getSelectedLabels();
 
        if (sel_rows.length > 0) {
@@ -567,10 +468,14 @@ function removeSelectedLabels() {
                if (ok) {
                        notify_progress("Removing selected labels...");
        
-                       xmlhttp.open("GET", "backend.php?op=pref-labels&subop=remove&ids="+
-                               param_escape(sel_rows.toString()), true);
-                       xmlhttp.onreadystatechange=labellist_callback;
-                       xmlhttp.send(null);
+                       var query = "backend.php?op=pref-labels&subop=remove&ids="+
+                               param_escape(sel_rows.toString());
+
+                       new Ajax.Request(query, {
+                               onComplete: function(transport) {
+                                               labellist_callback2(transport);
+                                       } });
+
                }
        } else {
                alert(__("No labels are selected."));
@@ -581,28 +486,33 @@ function removeSelectedLabels() {
 
 function removeSelectedUsers() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
-       var sel_rows = getSelectedUsers();
-
-       if (sel_rows.length > 0) {
-
-               var ok = confirm(__("Remove selected users?"));
+       try {
 
-               if (ok) {
-                       notify_progress("Removing selected users...");
+               var sel_rows = getSelectedUsers();
+       
+               if (sel_rows.length > 0) {
        
-                       xmlhttp.open("GET", "backend.php?op=pref-users&subop=remove&ids="+
-                               param_escape(sel_rows.toString()), true);
-                       xmlhttp.onreadystatechange=userlist_callback;
-                       xmlhttp.send(null);
+                       var ok = confirm(__("Remove selected users?"));
+       
+                       if (ok) {
+                               notify_progress("Removing selected users...");
+               
+                               var query = "backend.php?op=pref-users&subop=remove&ids="+
+                                       param_escape(sel_rows.toString());
+       
+                               new Ajax.Request(query, {
+                                       onComplete: function(transport) { 
+                                               userlist_callback2(transport); 
+                                       } });
+       
+                       }
+       
+               } else {
+                       alert(__("No users are selected."));
                }
 
-       } else {
-               alert(__("No users are selected."));
+       } catch (e) {
+               exception_error("removeSelectedUsers", e);
        }
 
        return false;
@@ -610,27 +520,32 @@ function removeSelectedUsers() {
 
 function removeSelectedFilters() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
-       var sel_rows = getSelectedFilters();
-
-       if (sel_rows.length > 0) {
-
-               var ok = confirm(__("Remove selected filters?"));
+       try {
 
-               if (ok) {
-                       notify_progress("Removing selected filters...");
+               var sel_rows = getSelectedFilters();
+       
+               if (sel_rows.length > 0) {
        
-                       xmlhttp.open("GET", "backend.php?op=pref-filters&subop=remove&ids="+
-                               param_escape(sel_rows.toString()), true);
-                       xmlhttp.onreadystatechange=filterlist_callback;
-                       xmlhttp.send(null);
+                       var ok = confirm(__("Remove selected filters?"));
+       
+                       if (ok) {
+                               notify_progress("Removing selected filters...");
+               
+                               var query = "backend.php?op=pref-filters&subop=remove&ids="+
+                                       param_escape(sel_rows.toString());
+       
+                               new Ajax.Request(query, {
+                                               onComplete: function(transport) {
+                                                               filterlist_callback2(transport);
+                                       } });
+       
+                       }
+               } else {
+                       alert(__("No filters are selected."));
                }
-       } else {
-               alert(__("No filters are selected."));
+
+       } catch (e) {
+               exception_error("removeSelectedFilters", e);
        }
 
        return false;
@@ -639,31 +554,33 @@ function removeSelectedFilters() {
 
 function removeSelectedFeeds() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
-       var sel_rows = getSelectedFeeds();
-
-       if (sel_rows.length > 0) {
-
-               var ok = confirm(__("Unsubscribe from selected feeds?"));
-
-               if (ok) {
+       try {
 
-                       notify_progress("Unsubscribing from selected feeds...");
+               var sel_rows = getSelectedFeeds();
+       
+               if (sel_rows.length > 0) {
+       
+                       var ok = confirm(__("Unsubscribe from selected feeds?"));
+       
+                       if (ok) {
+       
+                               notify_progress("Unsubscribing from selected feeds...");
+               
+                               var query = "backend.php?op=pref-feeds&subop=remove&ids="+
+                                       param_escape(sel_rows.toString());
+       
+                               new Ajax.Request(query, {
+                                       onComplete: function(transport) {
+                                                       feedlist_callback2(transport);
+                                               } });
+                       }
        
-                       xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=remove&ids="+
-                               param_escape(sel_rows.toString()), true);
-                       xmlhttp.onreadystatechange=feedlist_callback;
-                       xmlhttp.send(null);
+               } else {
+                       alert(__("No feeds are selected."));
                }
 
-       } else {
-
-               alert(__("No feeds are selected."));
-
+       } catch (e) {
+               exception_error("removeSelectedFeeds", e);
        }
        
        return false;
@@ -671,11 +588,6 @@ function removeSelectedFeeds() {
 
 function clearSelectedFeeds() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
        var sel_rows = getSelectedFeeds();
 
        if (sel_rows.length > 1) {
@@ -703,11 +615,6 @@ function clearSelectedFeeds() {
 
 function purgeSelectedFeeds() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
        var sel_rows = getSelectedFeeds();
 
        if (sel_rows.length > 0) {
@@ -739,11 +646,6 @@ function purgeSelectedFeeds() {
 
 function removeSelectedFeedCats() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
        var sel_rows = getSelectedFeedCats();
 
        if (sel_rows.length > 0) {
@@ -753,10 +655,14 @@ function removeSelectedFeedCats() {
                if (ok) {
                        notify_progress("Removing selected categories...");
        
-                       xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=editCats&action=remove&ids="+
-                               param_escape(sel_rows.toString()), true);
-                       xmlhttp.onreadystatechange=infobox_feed_cat_callback;
-                       xmlhttp.send(null);
+                       var query = "backend.php?op=pref-feeds&subop=editCats&action=remove&ids="+
+                               param_escape(sel_rows.toString());
+
+                       new Ajax.Request(query, {
+                               onComplete: function(transport) {
+                                       infobox_feed_cat_callback2(transport);
+                               } });
+
                }
 
        } else {
@@ -770,11 +676,6 @@ function removeSelectedFeedCats() {
 
 function feedEditCancel() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
        try {
                document.getElementById("subscribe_to_feed_btn").disabled = false;
                document.getElementById("top25_feeds_btn").disabled = false;
@@ -789,48 +690,21 @@ function feedEditCancel() {
        return false;
 }
 
-function feedCatEditCancel() {
-
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
-       active_feed_cat = false;
-
-       try {
-               document.getElementById("subscribe_to_feed_btn").disabled = false;
-               document.getElementById("top25_feeds_btn").disabled = false;
-       } catch (e) {
-               // this button is not always available, no-op if not found
-       }
-
-       xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=editCats", true);
-       xmlhttp.onreadystatechange=infobox_callback;
-       xmlhttp.send(null);
-
-       return false;
-}
-
 function feedEditSave() {
 
        try {
        
-               if (!xmlhttp_ready(xmlhttp)) {
-                       printLockingError();
-                       return
-               }
-
                // FIXME: add parameter validation
 
                var query = Form.serialize("edit_feed_form");
 
                notify_progress("Saving feed...");
 
-               xmlhttp.open("POST", "backend.php", true);
-               xmlhttp.onreadystatechange=feedlist_callback;
-               xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
-               xmlhttp.send(query);
+               new Ajax.Request("backend.php", {
+                       parameters: query,
+                       onComplete: function(transport) { 
+                               feedlist_callback2(transport); 
+                       } });
 
                closeInfoBox();
 
@@ -843,11 +717,6 @@ function feedEditSave() {
 
 function userEditCancel() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
        selectPrefRows('user', false); // cleanup feed selection
        closeInfoBox();
 
@@ -856,11 +725,6 @@ function userEditCancel() {
 
 function filterEditCancel() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
        try {
                document.getElementById("create_filter_btn").disabled = false;
                selectPrefRows('filter', false); // cleanup feed selection
@@ -873,116 +737,62 @@ function filterEditCancel() {
 
 function userEditSave() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
-       var login = document.forms["user_edit_form"].login.value;
-
-       if (login.length == 0) {
-               alert(__("Login field cannot be blank."));
-               return;
-       }
-       
-       notify_progress("Saving user...");
-
-       closeInfoBox();
-
-       var query = Form.serialize("user_edit_form");
-       
-       xmlhttp.open("GET", "backend.php?" + query, true);                      
-       xmlhttp.onreadystatechange=userlist_callback;
-       xmlhttp.send(null);
-
-       return false;
-}
-
-
-function filterEditSave() {
-
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
+       try {
 
-/*     if (!is_opera()) {
-               var reg_exp = document.forms["filter_edit_form"].reg_exp.value;
+               var login = document.forms["user_edit_form"].login.value;
        
-               if (reg_exp.length == 0) {
-                       alert("Filter expression field cannot be blank.");
+               if (login.length == 0) {
+                       alert(__("Login field cannot be blank."));
                        return;
                }
-       } */
-
-       notify_progress("Saving filter...");
-
-       var query = Form.serialize("filter_edit_form");
-
-       closeInfoBox();
-
-       document.getElementById("create_filter_btn").disabled = false;
-
-       xmlhttp.open("GET", "backend.php?" + query, true);
-       xmlhttp.onreadystatechange=filterlist_callback;
-       xmlhttp.send(null);
-
-       return false;
-}
-
-
-function editSelectedUser() {
-       var rows = getSelectedUsers();
-
-       if (rows.length == 0) {
-               alert(__("No users are selected."));
-               return;
-       }
-
-       if (rows.length > 1) {
-               alert(__("Please select only one user."));
-               return;
+               
+               notify_progress("Saving user...");
+       
+               closeInfoBox();
+       
+               var query = Form.serialize("user_edit_form");
+               
+               new Ajax.Request("backend.php", {
+                       parameters: query,
+                       onComplete: function(transport) { 
+                               userlist_callback2(transport); 
+                       } });
+       
+       } catch (e) {
+               exception_error("userEditSave", e);
        }
 
-       notify("");
+       return false;
 
-       editUser(rows[0]);
 }
 
-function resetSelectedUserPass() {
-       var rows = getSelectedUsers();
 
-       if (rows.length == 0) {
-               alert(__("No users are selected."));
-               return;
-       }
-
-       if (rows.length > 1) {
-               alert(__("Please select only one user."));
-               return;
-       }
+function filterEditSave() {
 
-       var ok = confirm(__("Reset password of selected user?"));
+       try {
 
-       if (ok) {
-               notify_progress("Resetting password for selected user...");
+               notify_progress("Saving filter...");
        
-               var id = rows[0];
+               var query = "backend.php?" + Form.serialize("filter_edit_form");
        
-               xmlhttp.open("GET", "backend.php?op=pref-users&subop=resetPass&id=" +
-                       param_escape(id), true);
-               xmlhttp.onreadystatechange=userlist_callback;
-               xmlhttp.send(null);
+               closeInfoBox();
+       
+               document.getElementById("create_filter_btn").disabled = false;
+
+               new Ajax.Request(query, {
+                               onComplete: function(transport) {
+                                               filterlist_callback2(transport);
+                       } });
+
+       } catch (e) {
+               exception_error("filterEditSave", e);
        }
-}
 
-function selectedUserDetails() {
+       return false;
+}
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
 
+function editSelectedUser() {
        var rows = getSelectedUsers();
 
        if (rows.length == 0) {
@@ -995,46 +805,81 @@ function selectedUserDetails() {
                return;
        }
 
-       notify_progress("Loading, please wait...");
-
-       var id = rows[0];
-
-       xmlhttp.open("GET", "backend.php?op=pref-users&subop=user-details&id=" + id, true);
-       xmlhttp.onreadystatechange=infobox_callback;
-       xmlhttp.send(null);
+       notify("");
 
+       editUser(rows[0]);
 }
 
-function selectedFeedDetails() {
-
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
+function resetSelectedUserPass() {
 
-       var rows = getSelectedFeeds();
+       try {
 
-       if (rows.length == 0) {
-               alert(__("No feeds are selected."));
-               return;
-       }
+               var rows = getSelectedUsers();
+       
+               if (rows.length == 0) {
+                       alert(__("No users are selected."));
+                       return;
+               }
+       
+               if (rows.length > 1) {
+                       alert(__("Please select only one user."));
+                       return;
+               }
+       
+               var ok = confirm(__("Reset password of selected user?"));
+       
+               if (ok) {
+                       notify_progress("Resetting password for selected user...");
+               
+                       var id = rows[0];
+               
+                       var query = "backend.php?op=pref-users&subop=resetPass&id=" +
+                               param_escape(id);
+       
+                       new Ajax.Request(query, {
+                               onComplete: function(transport) { 
+                                       userlist_callback2(transport); 
+                               } });
+       
+               }
 
-       if (rows.length > 1) {
-               alert(__("Please select only one feed."));
-               return;
+       } catch (e) {
+               exception_error("resetSelectedUserPass", e);
        }
+}
 
-//     var id = rows[0];
+function selectedUserDetails() {
 
-       notify("");
+       try {
 
-       xmlhttp.open("GET", "backend.php?op=feed-details&id=" + 
-               param_escape(rows.toString()), true);
-       xmlhttp.onreadystatechange=infobox_callback;
-       xmlhttp.send(null);
+               var rows = getSelectedUsers();
+       
+               if (rows.length == 0) {
+                       alert(__("No users are selected."));
+                       return;
+               }
+       
+               if (rows.length > 1) {
+                       alert(__("Please select only one user."));
+                       return;
+               }
+       
+               notify_progress("Loading, please wait...");
+       
+               var id = rows[0];
+       
+               var query = "backend.php?op=pref-users&subop=user-details&id=" + id;
 
+               new Ajax.Request(query, {
+                       onComplete: function(transport) {
+                                       infobox_callback2(transport);
+                               } });
+       } catch (e) {
+               exception_error("selectedUserDetails", e);
+       }
 }
 
+
 function editSelectedFilter() {
        var rows = getSelectedFilters();
 
@@ -1076,49 +921,31 @@ function editSelectedFeed() {
 
 function editSelectedFeeds() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
-       var rows = getSelectedFeeds();
-
-       if (rows.length == 0) {
-               alert(__("No feeds are selected."));
-               return;
-       }
-
-       notify("");
-
-       disableHotkeys();
-
-       notify_progress("Loading, please wait...");
-
-       xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=editfeeds&ids=" +
-               param_escape(rows.toString()), true);
-
-       xmlhttp.onreadystatechange=infobox_callback;
-       xmlhttp.send(null);
-
-}
-
-function editSelectedFeedCat() {
-       var rows = getSelectedFeedCats();
+       try {
+               var rows = getSelectedFeeds();
+       
+               if (rows.length == 0) {
+                       alert(__("No feeds are selected."));
+                       return;
+               }
+       
+               notify("");
+       
+               disableHotkeys();
+       
+               notify_progress("Loading, please wait...");
+       
+               var query = "backend.php?op=pref-feeds&subop=editfeeds&ids=" +
+                       param_escape(rows.toString());
 
-       if (rows.length == 0) {
-               alert(__("No categories are selected."));
-               return;
-       }
+               new Ajax.Request(query, {
+                       onComplete: function(transport) {
+                                       infobox_callback2(transport);
+                               } });
 
-       if (rows.length > 1) {
-               alert(__("Please select only one category."));
-               return;
+       } catch (e) {
+               exception_error("editSelectedFeeds", e);
        }
-
-       notify("");
-
-       editFeedCat(rows[0]);
-
 }
 
 function piggie(enable) {
@@ -1146,52 +973,57 @@ function validateOpmlImport() {
 }
 
 function updateFilterList(sort_key) {
+       try {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
+               var filter_search = document.getElementById("filter_search");
+               var search = "";
+               if (filter_search) { search = filter_search.value; }
+       
+               var query = "backend.php?op=pref-filters&sort=" + 
+                       param_escape(sort_key) + 
+                       "&search=" + param_escape(search);
 
-       var filter_search = document.getElementById("filter_search");
-       var search = "";
-       if (filter_search) { search = filter_search.value; }
+               new Ajax.Request(query, {
+                               onComplete: function(transport) {
+                                               filterlist_callback2(transport);
+                       } });
 
-       xmlhttp.open("GET", "backend.php?op=pref-filters&sort=" + 
-               param_escape(sort_key) + 
-               "&search=" + param_escape(search), true);
-       xmlhttp.onreadystatechange=filterlist_callback;
-       xmlhttp.send(null);
+       } catch (e) {
+               exception_error("updateFilterList", e);
+       }
 
 }
 
 function updateLabelList(sort_key) {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
+       try {
 
-       var label_search = document.getElementById("label_search");
-       var search = "";
-       if (label_search) { search = label_search.value; }
+               var label_search = document.getElementById("label_search");
+               var search = "";
+               if (label_search) { search = label_search.value; }
+       
+               var query = "backend.php?op=pref-labels&sort=" + 
+                       param_escape(sort_key) +
+                       "&search=" + param_escape(search);
+       
+               new Ajax.Request(query, {
+                       onComplete: function(transport) {
+                               labellist_callback2(transport);
+                       } });
 
-       xmlhttp.open("GET", "backend.php?op=pref-labels&sort=" + 
-               param_escape(sort_key) +
-               "&search=" + param_escape(search), true);
-       xmlhttp.onreadystatechange=labellist_callback;
-       xmlhttp.send(null);
+       } catch (e) {
+               exception_error("updateLabelList", e);
+       }
 }
 
 function updatePrefsList() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
+       var query = "backend.php?op=pref-prefs";
 
-       xmlhttp.open("GET", "backend.php?op=pref-prefs", true);
-       xmlhttp.onreadystatechange=prefslist_callback;
-       xmlhttp.send(null);
+       new Ajax.Request(query, {
+               onComplete: function(transport) { 
+                       prefslist_callback2(transport); 
+               } });
 
 }
 
@@ -1203,11 +1035,6 @@ function selectTab(id, noupdate, subop) {
 
        try {
 
-               if (!xmlhttp_ready(xmlhttp)) {
-                       printLockingError();
-                       return
-               }
-
                try {
                        var c = document.getElementById('prefContent'); 
                        c.scrollTop = 0;
@@ -1270,69 +1097,67 @@ function selectTab(id, noupdate, subop) {
        }
 }
 
-function backend_sanity_check_callback() {
+function backend_sanity_check_callback2(transport) {
 
-       if (xmlhttp.readyState == 4) {
+       try {
 
-               try {
+               if (sanity_check_done) {
+                       fatalError(11, "Sanity check request received twice. This can indicate "+
+                     "presence of Firebug or some other disrupting extension. "+
+                               "Please disable it and try again.");
+                       return;
+               }
 
-                       if (sanity_check_done) {
-                               fatalError(11, "Sanity check request received twice. This can indicate "+
-                             "presence of Firebug or some other disrupting extension. "+
-                                       "Please disable it and try again.");
-                               return;
-                       }
+               if (!transport.responseXML) {
+                       fatalError(3, "Sanity Check: Received reply is not XML", 
+                               transport.responseText);
+                       return;
+               }
 
-                       if (!xmlhttp.responseXML) {
-                               fatalError(3, "Sanity Check: Received reply is not XML", 
-                                       xmlhttp.responseText);
-                               return;
-                       }
-       
-                       var reply = xmlhttp.responseXML.firstChild.firstChild;
-       
-                       if (!reply) {
-                               fatalError(3, "Sanity Check: Invalid RPC reply", xmlhttp.responseText);
-                               return;
-                       }
-       
-                       var error_code = reply.getAttribute("error-code");
-               
-                       if (error_code && error_code != 0) {
-                               return fatalError(error_code, reply.getAttribute("error-msg"));
-                       }
+               var reply = transport.responseXML.firstChild.firstChild;
+
+               if (!reply) {
+                       fatalError(3, "Sanity Check: Invalid RPC reply", transport.responseText);
+                       return;
+               }
+
+               var error_code = reply.getAttribute("error-code");
        
-                       debug("sanity check ok");
+               if (error_code && error_code != 0) {
+                       return fatalError(error_code, reply.getAttribute("error-msg"));
+               }
 
-                       var params = reply.nextSibling;
+               debug("sanity check ok");
 
-                       if (params) {
-                               debug('reading init-params...');
-                               var param = params.firstChild;
+               var params = reply.nextSibling;
 
-                               while (param) {
-                                       var k = param.getAttribute("key");
-                                       var v = param.getAttribute("value");
-                                       debug(k + " => " + v);
-                                       init_params[k] = v;                                     
-                                       param = param.nextSibling;
-                               }
+               if (params) {
+                       debug('reading init-params...');
+                       var param = params.firstChild;
+
+                       while (param) {
+                               var k = param.getAttribute("key");
+                               var v = param.getAttribute("value");
+                               debug(k + " => " + v);
+                               init_params[k] = v;                                     
+                               param = param.nextSibling;
                        }
+               }
 
-                       sanity_check_done = true;
+               sanity_check_done = true;
 
-                       init_second_stage();
+               init_second_stage();
 
-               } catch (e) {
-                       exception_error("backend_sanity_check_callback", e);
-               }
-       } 
+       } catch (e) {
+               exception_error("backend_sanity_check_callback", e);
+       }
 }
 
 function init_second_stage() {
 
        try {
                active_tab = getInitParam("prefs_active_tab");
+               if (!document.getElementById(active_tab+"Tab")) active_tab = "genConfig";
                if (!active_tab || active_tab == '0') active_tab = "genConfig";
 
                document.onkeydown = pref_hotkey_handler;
@@ -1375,19 +1200,14 @@ function init() {
                        debug('debug mode activated');
                }
 
-               // IE kludge
-               if (!xmlhttp) {
-                       document.getElementById("prefContent").innerHTML = 
-                               "<b>Fatal error:</b> This program needs XmlHttpRequest " + 
-                               "to function properly. Your browser doesn't seem to support it.";
-                       return;
-               }
-
                loading_set_progress(30);
 
-               xmlhttp.open("GET", "backend.php?op=rpc&subop=sanityCheck", true);
-               xmlhttp.onreadystatechange=backend_sanity_check_callback;
-               xmlhttp.send(null);
+               var query = "backend.php?op=rpc&subop=sanityCheck";
+
+               new Ajax.Request(query, {
+                       onComplete: function(transport) { 
+                               backend_sanity_check_callback2(transport);
+                       } });
 
        } catch (e) {
                exception_error("init", e);
@@ -1396,11 +1216,6 @@ function init() {
 
 function categorizeSelectedFeeds() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
        var sel_rows = getSelectedFeeds();
 
        var cat_sel = document.getElementById("sfeed_set_fcat");
@@ -1410,10 +1225,13 @@ function categorizeSelectedFeeds() {
 
                notify_progress("Changing category of selected feeds...");
 
-               xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=categorize&ids="+
-                       param_escape(sel_rows.toString()) + "&cat_id=" + param_escape(cat_id), true);
-               xmlhttp.onreadystatechange=feedlist_callback;
-               xmlhttp.send(null);
+               var query = "backend.php?op=pref-feeds&subop=categorize&ids="+
+                       param_escape(sel_rows.toString()) + "&cat_id=" + param_escape(cat_id);
+
+               new Ajax.Request(query, {
+                       onComplete: function(transport) { 
+                               feedlist_callback2(transport); 
+                       } });
 
        } else {
 
@@ -1433,10 +1251,12 @@ function validatePrefsReset() {
                        query = query + "&subop=reset-config";
                        debug(query);
 
-                       xmlhttp.open("POST", "backend.php", true);
-                       xmlhttp.onreadystatechange=prefs_reset_callback;
-                       xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
-                       xmlhttp.send(query);
+                       new Ajax.Request("backend.php", {
+                               parameters: query,
+                               onComplete: function(transport) { 
+                                       prefs_reset_callback2(transport);
+                               } });
+
                }
 
        } catch (e) {
@@ -1447,14 +1267,6 @@ function validatePrefsReset() {
 
 }
 
-function browseFeeds(limit) {
-
-       xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=browse", true);
-       xmlhttp.onreadystatechange=infobox_callback;
-       xmlhttp.send(null);
-
-}
-
 function feedBrowserSubscribe() {
        try {
 
@@ -1462,10 +1274,15 @@ function feedBrowserSubscribe() {
 
                if (selected.length > 0) {
                        closeInfoBox();
-                       xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=massSubscribe&ids="+
-                               param_escape(selected.toString()), true);
-                       xmlhttp.onreadystatechange=feedlist_callback;
-                       xmlhttp.send(null);
+
+                       var query = "backend.php?op=pref-feeds&subop=massSubscribe&ids="+
+                               param_escape(selected.toString());
+
+                       new Ajax.Request(query, {
+                               onComplete: function(transport) { 
+                                       feedlist_callback2(transport); 
+                               } });
+
                } else {
                        alert(__("No feeds are selected."));
                }
@@ -1747,22 +1564,24 @@ function pref_hotkey_handler(e) {
 }
 
 function editFeedCats() {
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
-       document.getElementById("subscribe_to_feed_btn").disabled = true;
-
        try {
-               document.getElementById("top25_feeds_btn").disabled = true;
+               document.getElementById("subscribe_to_feed_btn").disabled = true;
+       
+               try {
+                       document.getElementById("top25_feeds_btn").disabled = true;
+               } catch (e) {
+                       // this button is not always available, no-op if not found
+               }
+       
+               var query = "backend.php?op=pref-feeds&subop=editCats";
+
+               new Ajax.Request(query, {
+                       onComplete: function(transport) {
+                               infobox_feed_cat_callback2(transport);
+                       } });
        } catch (e) {
-               // this button is not always available, no-op if not found
+               exception_error("editFeedCats", e);
        }
-
-       xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=editCats", true);
-       xmlhttp.onreadystatechange=infobox_feed_cat_callback;
-       xmlhttp.send(null);
 }
 
 function showFeedsWithErrors() {
@@ -1773,11 +1592,6 @@ function changeUserPassword() {
 
        try {
 
-               if (!xmlhttp_ready(xmlhttp)) {
-                       printLockingError();
-                       return false;
-               }
-       
                var f = document.forms["change_pass_form"];
 
                if (f) {
@@ -1811,11 +1625,13 @@ function changeUserPassword() {
                var query = Form.serialize("change_pass_form");
        
                notify_progress("Trying to change password...");
-       
-               xmlhttp.open("POST", "backend.php", true);
-               xmlhttp.onreadystatechange=changepass_callback;
-               xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
-               xmlhttp.send(query);
+
+               new Ajax.Request("backend.php", {
+                       parameters: query,
+                       onComplete: function(transport) { 
+                               changepass_callback2(transport); 
+                       } });
+
 
        } catch (e) {
                exception_error("changeUserPassword", e);
@@ -1828,19 +1644,15 @@ function changeUserEmail() {
 
        try {
 
-               if (!xmlhttp_ready(xmlhttp)) {
-                       printLockingError();
-                       return false;
-               }
-       
                var query = Form.serialize("change_email_form");
        
                notify_progress("Trying to change e-mail...");
        
-               xmlhttp.open("POST", "backend.php", true);
-               xmlhttp.onreadystatechange=notify_callback;
-               xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
-               xmlhttp.send(query);
+               new Ajax.Request("backend.php", {
+                       parameters: query,
+                       onComplete: function(transport) { 
+                               notify_callback2(transport); 
+                       } });
 
        } catch (e) {
                exception_error("changeUserPassword", e);
@@ -1857,42 +1669,22 @@ function feedlistToggleSLAT() {
 
 function pubRegenKey() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return false;
-       }
-
        var ok = confirm(__("Replace current publishing address with a new one?"));
 
        if (ok) {
 
                notify_progress("Trying to change address...");
 
-               xmlhttp.open("GET", "backend.php?op=rpc&subop=regenPubKey");
-               xmlhttp.onreadystatechange=replace_pubkey_callback;
-               xmlhttp.send(null);
-       }
-
-       return false;
-}
-
-function pubToClipboard() {
-
-       try {
+               var query = "backend.php?op=rpc&subop=regenPubKey";
 
-               if (!xmlhttp_ready(xmlhttp)) {
-                       printLockingError();
-                       return false;
-               }
-       
-               var link = document.getElementById("pubGenAddress");
-               alert(link.href);
+               new Ajax.Request(query, {
+                       onComplete: function(transport) {
+                                       replace_pubkey_callback(transport);
+                               } });
 
-       } catch (e) {
-               exception_error("pubToClipboard", e);
        }
 
-       return false; 
+       return false;
 }
 
 function validatePrefsSave() {
@@ -1906,10 +1698,12 @@ function validatePrefsSave() {
                        query = query + "&subop=save-config";
                        debug(query);
 
-                       xmlhttp.open("POST", "backend.php", true);
-                       xmlhttp.onreadystatechange=notify_callback;
-                       xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
-                       xmlhttp.send(query);
+                       new Ajax.Request("backend.php", {
+                               parameters: query,
+                               onComplete: function(transport) { 
+                               notify_callback2(transport); 
+                       } });
+
                }
 
        } catch (e) {
@@ -1986,11 +1780,6 @@ function clearFeedArticles(feed_id) {
 
 function rescoreSelectedFeeds() {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
        var sel_rows = getSelectedFeeds();
 
        if (sel_rows.length > 0) {
@@ -2001,10 +1790,14 @@ function rescoreSelectedFeeds() {
                if (ok) {
                        notify_progress("Rescoring selected feeds...", true);
        
-                       xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=rescore&quiet=1&ids="+
-                               param_escape(sel_rows.toString()), true);
-                       xmlhttp.onreadystatechange=notify_callback;
-                       xmlhttp.send(null);
+                       var query = "backend.php?op=pref-feeds&subop=rescore&quiet=1&ids="+
+                               param_escape(sel_rows.toString());
+
+                       new Ajax.Request(query, {
+                               onComplete: function(transport) {
+                                               notify_callback2(transport);
+                       } });
+
                }
        } else {
                alert(__("No feeds are selected."));
@@ -2014,37 +1807,45 @@ function rescoreSelectedFeeds() {
 }
 
 function rescore_all_feeds() {
-               var ok = confirm(__("Rescore all articles? This operation may take a lot of time."));
+       var ok = confirm(__("Rescore all articles? This operation may take a lot of time."));
 
-               if (ok) {
-                       notify_progress("Rescoring feeds...", true);
+       if (ok) {
+               notify_progress("Rescoring feeds...", true);
 
-                       xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=rescoreAll&quiet=1", true);
-                       xmlhttp.onreadystatechange=notify_callback;
-                       xmlhttp.send(null);
-               }
+               var query = "backend.php?op=pref-feeds&subop=rescoreAll&quiet=1";
+
+               new Ajax.Request(query, {
+                       onComplete: function(transport) {
+                                       notify_callback2(transport);
+               } });
+       }
 }
 
 function removeFilter(id, title) {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
+       try {
 
-       var msg = __("Remove filter %s?").replace("%s", title);
+               var msg = __("Remove filter %s?").replace("%s", title);
+       
+               var ok = confirm(msg);
+       
+               if (ok) {
+                       closeInfoBox();
+       
+                       notify_progress("Removing filter...");
+               
+                       var query = "backend.php?op=pref-filters&subop=remove&ids="+
+                               param_escape(id);
 
-       var ok = confirm(msg);
+                       new Ajax.Request(query, {
+                               onComplete: function(transport) {
+                                               filterlist_callback2(transport);
+                       } });
 
-       if (ok) {
-               closeInfoBox();
+               }
 
-               notify_progress("Removing filter...");
-       
-               xmlhttp.open("GET", "backend.php?op=pref-filters&subop=remove&ids="+
-                       param_escape(id), true);
-               xmlhttp.onreadystatechange=filterlist_callback;
-               xmlhttp.send(null);
+       } catch (e) {
+               exception_error("removeFilter", e);
        }
 
        return false;
@@ -2052,40 +1853,37 @@ function removeFilter(id, title) {
 
 function unsubscribeFeed(id, title) {
 
-       if (!xmlhttp_ready(xmlhttp)) {
-               printLockingError();
-               return
-       }
-
-       var msg = __("Unsubscribe from %s?").replace("%s", title);
-
-       var ok = confirm(msg);
-
-       if (ok) {
-               closeInfoBox();
+       try {
 
-               notify_progress("Removing feed...");
+               var msg = __("Unsubscribe from %s?").replace("%s", title);
+       
+               var ok = confirm(msg);
        
-               xmlhttp.open("GET", "backend.php?op=pref-feeds&subop=remove&ids="+
-                       param_escape(id), true);
-               xmlhttp.onreadystatechange=filterlist_callback;
-               xmlhttp.send(null);
+               if (ok) {
+                       closeInfoBox();
+       
+                       notify_progress("Removing feed...");
+               
+                       var query = "backend.php?op=pref-feeds&subop=remove&ids="+
+                               param_escape(id);
+       
+                       new Ajax.Request(query, {
+                                       onComplete: function(transport) {
+                                                       feedlist_callback2(transport);
+                               } });
+               }
+       
+       } catch (e) {
+               exception_error("unsubscribeFeed", e);
        }
 
        return false;
 
-       return false;
-
 }
 
 function feedsEditSave() {
        try {
 
-               if (!xmlhttp_ready(xmlhttp)) {
-                       printLockingError();
-                       return
-               }
-
                var ok = confirm(__("Save changes to selected feeds?"));
 
                if (ok) {
@@ -2125,10 +1923,12 @@ function feedsEditSave() {
        
                        notify_progress("Saving feeds...");
        
-                       xmlhttp.open("POST", "backend.php", true);
-                       xmlhttp.onreadystatechange=feedlist_callback;
-                       xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
-                       xmlhttp.send(query);
+                       new Ajax.Request("backend.php", {
+                               parameters: query,
+                               onComplete: function(transport) { 
+                                       feedlist_callback2(transport); 
+                               } });
+
                }
 
                return false;