functions.js

   1 var hotkeys_enabled = true;
   2
   3 function exception_error(location, e) {
   4         var msg;
   5
   6         if (e.fileName) {
   7                 var base_fname = e.fileName.substring(e.fileName.lastIndexOf("/") + 1);
   8
   9                 msg = "Exception: " + e.name + ", " + e.message +
  10                         "\nFunction: " + location + "()" +
  11                         "\nLocation: " + base_fname + ":" + e.lineNumber;
  12         } else {
  13                 msg = "Exception: " + e + "\nFunction: " + location + "()";
  14         }
  15
  16         alert(msg);
  17 }
  18
  19 function disableHotkeys() {
  20         hotkeys_enabled = false;
  21 }
  22
  23 function enableHotkeys() {
  24         hotkeys_enabled = true;
  25 }
  26
  27 function xmlhttp_ready(obj) {
  28         return obj.readyState == 4 || obj.readyState == 0 || !obj.readyState;
  29 }
  30
  31
  32 function notify_callback() {
  33         var container = document.getElementById('notify');
  34         if (xmlhttp.readyState == 4) {
  35                 container.innerHTML=xmlhttp.responseText;
  36         }
  37 }
  38
  39 function rpc_notify_callback() {
  40         var container = document.getElementById('notify');
  41         if (xmlhttp_rpc.readyState == 4) {
  42                 container.innerHTML=xmlhttp_rpc.responseText;
  43         }
  44 }
  45
  46 function rpc_pnotify_callback() {
  47         var container = parent.document.getElementById('notify');
  48         if (xmlhttp_rpc.readyState == 4) {
  49                 container.innerHTML=xmlhttp_rpc.responseText;
  50         }
  51 }
  52
  53 function param_escape(arg) {
  54         if (typeof encodeURIComponent != 'undefined')
  55                 return encodeURIComponent(arg);
  56         else
  57                 return escape(arg);
  58 }
  59
  60 function param_unescape(arg) {
  61         if (typeof decodeURIComponent != 'undefined')
  62                 return decodeURIComponent(arg);
  63         else
  64                 return unescape(arg);
  65 }
  66
  67 function delay(gap) {
  68         var then,now;
  69         then=new Date().getTime();
  70         now=then;
  71         while((now-then)<gap) {
  72                 now=new Date().getTime();
  73         }
  74 }
  75
  76 function p_notify(msg) {
  77
  78         var n = parent.document.getElementById("notify");
  79         var nb = parent.document.getElementById("notify_body");
  80
  81         if (!n || !nb) return;
  82
  83         if (msg == "") {
  84                 nb.innerHTML = "&nbsp;";
  85 //              n.style.background = "#ffffff";
  86         } else {
  87                 nb.innerHTML = msg;
  88 //              n.style.background = "#fffff0";
  89         }
  90 }
  91
  92 function notify(msg) {
  93
  94         var n = document.getElementById("notify");
  95         var nb = document.getElementById("notify_body");
  96
  97         if (!n || !nb) return;
  98
  99         if (msg == "") {
 100                 nb.innerHTML = "&nbsp;";
 101 //              n.style.background = "#ffffff";
 102         } else {
 103                 nb.innerHTML = msg;
 104 //              n.style.background = "#fffff0";
 105         }
 106
 107 }
 108
 109 function printLockingError() {
 110         notify("Please wait until operation finishes");}
 111
 112 var seq = "";
 113
 114 function hotkey_handler(e) {
 115
 116         var keycode;
 117
 118         if (!hotkeys_enabled) return;
 119
 120         if (window.event) {
 121                 keycode = window.event.keyCode;
 122         } else if (e) {
 123                 keycode = e.which;
 124         }
 125
 126         if (keycode == 13 || keycode == 27) {
 127                 seq = "";
 128         } else {
 129                 seq = seq + "" + keycode;
 130         }
 131
 132         if (document.getElementById("piggie")) {
 133
 134                 if (seq.match("807371717369")) {
 135                         seq = "";
 136                         localPiggieFunction(true);
 137                 } else {
 138                         localPiggieFunction(false);
 139                 }
 140         }
 141
 142         if (typeof localHotkeyHandler != 'undefined') {
 143                 try {
 144                         localHotkeyHandler(keycode);
 145                 } catch (e) {
 146                         exception_error("hotkey_handler", e);
 147                 }
 148         }
 149
 150 }
 151
 152 function cleanSelectedList(element) {
 153         var content = document.getElementById(element);
 154
 155         if (!document.getElementById("feedCatHolder")) {
 156                 for (i = 0; i < content.childNodes.length; i++) {
 157                         var child = content.childNodes[i];
 158                         try {
 159                                 child.className = child.className.replace("Selected", "");
 160                         } catch (e) {
 161                                 //
 162                         }
 163                 }
 164         } else {
 165                 for (i = 0; i < content.childNodes.length; i++) {
 166                         var child = content.childNodes[i];
 167                         if (child.id == "feedCatHolder") {
 168                                 parent.debug(child.id);
 169                                 var fcat = child.lastChild;
 170                                 for (j = 0; j < fcat.childNodes.length; j++) {
 171                                         var feed = fcat.childNodes[j];
 172                                         feed.className = feed.className.replace("Selected", "");
 173                                 }
 174                         }
 175                 }
 176         }
 177 }
 178
 179
 180 function cleanSelected(element) {
 181         var content = document.getElementById(element);
 182
 183         for (i = 0; i < content.rows.length; i++) {
 184                 content.rows[i].className = content.rows[i].className.replace("Selected", "");
 185         }
 186 }
 187
 188 function getVisibleUnreadHeadlines() {
 189         var content = document.getElementById("headlinesList");
 190
 191         var rows = new Array();
 192
 193         for (i = 0; i < content.rows.length; i++) {
 194                 var row_id = content.rows[i].id.replace("RROW-", "");
 195                 if (row_id.length > 0 && content.rows[i].className.match("Unread")) {
 196                                 rows.push(row_id);
 197                 }
 198         }
 199         return rows;
 200 }
 201
 202 function getVisibleHeadlineIds() {
 203
 204         var content = document.getElementById("headlinesList");
 205
 206         var rows = new Array();
 207
 208         for (i = 0; i < content.rows.length; i++) {
 209                 var row_id = content.rows[i].id.replace("RROW-", "");
 210                 if (row_id.length > 0) {
 211                                 rows.push(row_id);
 212                 }
 213         }
 214         return rows;
 215 }
 216
 217 function getFirstVisibleHeadlineId() {
 218         var rows = getVisibleHeadlineIds();
 219         return rows[0];
 220 }
 221
 222 function getLastVisibleHeadlineId() {
 223         var rows = getVisibleHeadlineIds();
 224         return rows[rows.length-1];
 225 }
 226
 227 function markHeadline(id) {
 228         var row = document.getElementById("RROW-" + id);
 229         if (row) {
 230                 var is_active = false;
 231
 232                 if (row.className.match("Active")) {
 233                         is_active = true;
 234                 }
 235                 row.className = row.className.replace("Selected", "");
 236                 row.className = row.className.replace("Active", "");
 237                 row.className = row.className.replace("Insensitive", "");
 238
 239                 if (is_active) {
 240                         row.className = row.className = "Active";
 241                 }
 242
 243                 var check = document.getElementById("RCHK-" + id);
 244
 245                 if (check) {
 246                         check.checked = true;
 247                 }
 248
 249                 row.className = row.className + "Selected";
 250
 251         }
 252 }
 253
 254 function getFeedIds() {
 255         var content = document.getElementById("feedsList");
 256
 257         var rows = new Array();
 258
 259         for (i = 0; i < content.rows.length; i++) {
 260                 var id = content.rows[i].id.replace("FEEDR-", "");
 261                 if (id.length > 0) {
 262                         rows.push(id);
 263                 }
 264         }
 265
 266         return rows;
 267 }
 268
 269 function setCookie(name, value, lifetime, path, domain, secure) {
 270
 271         var d = false;
 272
 273         if (lifetime) {
 274                 d = new Date();
 275                 d.setTime(lifetime * 1000);
 276         }
 277
 278         int_setCookie(name, value, d, path, domain, secure);
 279
 280 }
 281
 282 function int_setCookie(name, value, expires, path, domain, secure) {
 283         document.cookie= name + "=" + escape(value) +
 284                 ((expires) ? "; expires=" + expires.toGMTString() : "") +
 285                 ((path) ? "; path=" + path : "") +
 286                 ((domain) ? "; domain=" + domain : "") +
 287                 ((secure) ? "; secure" : "");
 288 }
 289
 290 function delCookie(name, path, domain) {
 291         if (getCookie(name)) {
 292                 document.cookie = name + "=" +
 293                 ((path) ? ";path=" + path : "") +
 294                 ((domain) ? ";domain=" + domain : "" ) +
 295                 ";expires=Thu, 01-Jan-1970 00:00:01 GMT";
 296         }
 297 }
 298
 299
 300 function getCookie(name) {
 301
 302         var dc = document.cookie;
 303         var prefix = name + "=";
 304         var begin = dc.indexOf("; " + prefix);
 305         if (begin == -1) {
 306             begin = dc.indexOf(prefix);
 307             if (begin != 0) return null;
 308         }
 309         else {
 310             begin += 2;
 311         }
 312         var end = document.cookie.indexOf(";", begin);
 313         if (end == -1) {
 314             end = dc.length;
 315         }
 316         return unescape(dc.substring(begin + prefix.length, end));
 317 }
 318
 319 function disableContainerChildren(id, disable, doc) {
 320
 321         if (!doc) doc = document;
 322
 323         var container = doc.getElementById(id);
 324
 325         for (var i = 0; i < container.childNodes.length; i++) {
 326                 var child = container.childNodes[i];
 327
 328                 try {
 329                         child.disabled = disable;
 330                 } catch (E) {
 331
 332                 }
 333
 334                 if (disable) {
 335                         if (child.className && child.className.match("button")) {
 336                                 child.className = "disabledButton";
 337                         }
 338                 } else {
 339                         if (child.className && child.className.match("disabledButton")) {
 340                                 child.className = "button";
 341                         }
 342                 }
 343         }
 344
 345 }
 346
 347 function gotoPreferences() {
 348         document.location.href = "prefs.php";
 349 }
 350
 351 function gotoMain() {
 352         document.location.href = "tt-rss.php";
 353 }
 354
 355 function gotoExportOpml() {
 356         document.location.href = "opml.php?op=Export";
 357 }
 358
 359 function getActiveFeedId() {
 360         return getCookie("ttrss_vf_actfeed");
 361 }
 362
 363 function setActiveFeedId(id) {
 364         return setCookie("ttrss_vf_actfeed", id);
 365 }
 366
 367 var xmlhttp_rpc = false;
 368
 369 /*@cc_on @*/
 370 /*@if (@_jscript_version >= 5)
 371 // JScript gives us Conditional compilation, we can cope with old IE versions.
 372 // and security blocked creation of the objects.
 373 try {
 374         xmlhttp_rpc = new ActiveXObject("Msxml2.XMLHTTP");
 375 } catch (e) {
 376         try {
 377                 xmlhttp_rpc = new ActiveXObject("Microsoft.XMLHTTP");
 378         } catch (E) {
 379                 xmlhttp_rpc = false;
 380         }
 381 }
 382 @end @*/
 383
 384 if (!xmlhttp_rpc && typeof XMLHttpRequest!='undefined') {
 385         xmlhttp_rpc = new XMLHttpRequest();
 386 }
 387
 388 function parse_counters(reply, f_document, title_obj, scheduled_call) {
 389         try {
 390                 for (var l = 0; l < reply.childNodes.length; l++) {
 391                         if (!reply.childNodes[l] ||
 392                                 typeof(reply.childNodes[l].getAttribute) == "undefined") {
 393                                 // where did this come from?
 394                                 continue;
 395                         }
 396
 397                         var id = reply.childNodes[l].getAttribute("id");
 398                         var t = reply.childNodes[l].getAttribute("type");
 399                         var ctr = reply.childNodes[l].getAttribute("counter");
 400                         var error = reply.childNodes[l].getAttribute("error");
 401                         var has_img = reply.childNodes[l].getAttribute("hi");
 402
 403                         if (id == "global-unread") {
 404                                 title_obj.global_unread = ctr;
 405                                 title_obj.updateTitle();
 406                                 continue;
 407                         }
 408
 409                         if (t == "category") {
 410                                 var catctr = f_document.getElementById("FCATCTR-" + id);
 411                                 if (catctr) {
 412                                         catctr.innerHTML = "(" + ctr + " unread)";
 413                                 }
 414                                 continue;
 415                         }
 416
 417                         var feedctr = f_document.getElementById("FEEDCTR-" + id);
 418                         var feedu = f_document.getElementById("FEEDU-" + id);
 419                         var feedr = f_document.getElementById("FEEDR-" + id);
 420                         var feed_img = f_document.getElementById("FIMG-" + id);
 421
 422                         if (feedctr && feedu && feedr) {
 423
 424                                 if (feedu.innerHTML != ctr && id == getActiveFeedId() && scheduled_call) {
 425                                         var hf = title_obj.parent.frames["headlines-frame"];
 426                                         hf.location.reload(true);
 427                                 }
 428
 429                                 feedu.innerHTML = ctr;
 430
 431                                 if (error) {
 432                                         feedr.className = feedr.className.replace("feed", "error");
 433                                 } else if (id > 0) {
 434                                         feedr.className = feedr.className.replace("error", "feed");
 435                                 }
 436
 437                                 if (ctr > 0) {
 438                                         feedctr.className = "odd";
 439                                         if (!feedr.className.match("Unread")) {
 440                                                 var is_selected = feedr.className.match("Selected");
 441
 442                                                 feedr.className = feedr.className.replace("Selected", "");
 443                                                 feedr.className = feedr.className.replace("Unread", "");
 444
 445                                                 feedr.className = feedr.className + "Unread";
 446
 447                                                 if (is_selected) {
 448                                                         feedr.className = feedr.className + "Selected";
 449                                                 }
 450
 451                                         }
 452                                 } else {
 453                                         feedctr.className = "invisible";
 454                                         feedr.className = feedr.className.replace("Unread", "");
 455                                 }
 456                         }
 457                 }
 458         } catch (e) {
 459                 exception_error("parse_counters", e);
 460         }
 461 }
 462
 463 // this one is called from feedlist context
 464 // thus title_obj passed to parse_counters is parent (e.g. main ttrss window)
 465
 466 function all_counters_callback() {
 467         if (xmlhttp_rpc.readyState == 4) {
 468                 try {
 469                         if (!xmlhttp_rpc.responseXML || !xmlhttp_rpc.responseXML.firstChild) {
 470                                 notify("[all_counters_callback] backend did not return valid XML");
 471                                 return;
 472                         }
 473
 474                         if (!parent.frames["feeds-frame"]) {
 475                                 notify("[all_counters_callback] no parent feeds-frame");
 476                                 return;
 477                         }
 478
 479                         var reply = xmlhttp_rpc.responseXML.firstChild;
 480                         var f_document = parent.frames["feeds-frame"].document;
 481
 482                         parse_counters(reply, f_document, parent);
 483
 484                 } catch (e) {
 485                         exception_error("all_counters_callback", e);
 486                 }
 487         }
 488 }
 489
 490 function update_all_counters(feed) {
 491         if (xmlhttp_ready(xmlhttp_rpc)) {
 492                 var query = "backend.php?op=rpc&subop=getAllCounters";
 493
 494                 if (feed > 0) {
 495                         query = query + "&aid=" + feed;
 496                 }
 497
 498                 xmlhttp_rpc.open("GET", query, true);
 499                 xmlhttp_rpc.onreadystatechange=all_counters_callback;
 500                 xmlhttp_rpc.send(null);
 501         }
 502 }
 503
 504 function popupHelp(tid) {
 505         var w = window.open("backend.php?op=help&tid=" + tid,
 506                 "Popup Help",
 507                 "menubar=no,location=no,resizable=yes,scrollbars=yes,status=no");
 508 }
 509
 510 /** * @(#)isNumeric.js * * Copyright (c) 2000 by Sundar Dorai-Raj
 511   * * @author Sundar Dorai-Raj
 512   * * Email: sdoraira@vt.edu
 513   * * This program is free software; you can redistribute it and/or
 514   * * modify it under the terms of the GNU General Public License
 515   * * as published by the Free Software Foundation; either version 2
 516   * * of the License, or (at your option) any later version,
 517   * * provided that any use properly credits the author.
 518   * * This program is distributed in the hope that it will be useful,
 519   * * but WITHOUT ANY WARRANTY; without even the implied warranty of
 520   * * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 521   * * GNU General Public License for more details at http://www.gnu.org * * */
 522
 523   var numbers=".0123456789";
 524   function isNumeric(x) {
 525     // is x a String or a character?
 526     if(x.length>1) {
 527       // remove negative sign
 528       x=Math.abs(x)+"";
 529       for(j=0;j<x.length;j++) {
 530         // call isNumeric recursively for each character
 531         number=isNumeric(x.substring(j,j+1));
 532         if(!number) return number;
 533       }
 534       return number;
 535     }
 536     else {
 537       // if x is number return true
 538       if(numbers.indexOf(x)>=0) return true;
 539       return false;
 540     }
 541   }
 542
 543
 544 function hideOrShowFeeds(doc, hide) {
 545
 546         if (!doc.styleSheets) return;
 547
 548         var css_rules = doc.styleSheets[0].cssRules;
 549
 550         if (!css_rules || !css_rules.length) return;
 551
 552         for (i = 0; i < css_rules.length; i++) {
 553                 var rule = css_rules[i];
 554
 555                 if (rule.selectorText == "ul.feedList li.feed") {
 556                         if (!hide) {
 557                                 rule.style.display = "block";
 558                         } else {
 559                                 rule.style.display = "none";
 560                         }
 561                 }
 562
 563         }
 564
 565 }
 566
 567 function fatalError(code, params) {
 568         if (!params) {
 569                 window.location = "error.php?c=" + param_escape(code);
 570         } else {
 571                 window.location = "error.php?c=" + param_escape(code) +
 572                         "&p=" + param_escape(params);
 573         }
 574 }
 575
 576 function selectTableRow(r, do_select) {
 577         r.className = r.className.replace("Selected", "");
 578
 579         if (do_select) {
 580                 r.className = r.className + "Selected";
 581         }
 582 }
 583
 584 function selectTableRowById(elem_id, check_id, do_select) {
 585
 586         try {
 587
 588                 var row = document.getElementById(elem_id);
 589
 590                 if (row) {
 591                         selectTableRow(row, do_select);
 592                 }
 593
 594                 var check = document.getElementById(check_id);
 595
 596                 if (check) {
 597                         check.checked = do_select;
 598                 }
 599         } catch (e) {
 600                 exception_error("selectTableRowById", e);
 601         }
 602 }
 603
 604 function selectTableRowsByIdPrefix(content_id, prefix, check_prefix, do_select,
 605         classcheck, reset_others) {
 606
 607         var content = document.getElementById(content_id);
 608
 609         if (!content) {
 610                 alert("[selectTableRows] Element " + content_id + " not found.");
 611                 return;
 612         }
 613
 614         for (i = 0; i < content.rows.length; i++) {
 615                 if (!classcheck || content.rows[i].className.match(classcheck)) {
 616
 617                         if (content.rows[i].id.match(prefix)) {
 618                                 selectTableRow(content.rows[i], do_select);
 619
 620                                 var row_id = content.rows[i].id.replace(prefix, "");
 621                                 var check = document.getElementById(check_prefix + row_id);
 622
 623                                 if (check) {
 624                                         check.checked = do_select;
 625                                 }
 626                         } else if (reset_others) {
 627                                 selectTableRow(content.rows[i], false);
 628
 629                                 var row_id = content.rows[i].id.replace(prefix, "");
 630                                 var check = document.getElementById(check_prefix + row_id);
 631
 632                                 if (check) {
 633                                         check.checked = false;
 634                                 }
 635
 636                         }
 637                 } else if (reset_others) {
 638                         selectTableRow(content.rows[i], false);
 639
 640                         var row_id = content.rows[i].id.replace(prefix, "");
 641                         var check = document.getElementById(check_prefix + row_id);
 642
 643                         if (check) {
 644                                 check.checked = false;
 645                         }
 646
 647                 }
 648         }
 649 }
 650
 651 function getSelectedTableRowIds(content_id, prefix) {
 652
 653         var content = document.getElementById(content_id);
 654
 655         if (!content) {
 656                 alert("[getSelectedTableRowIds] Element " + content_id + " not found.");
 657                 return;
 658         }
 659
 660         var sel_rows = new Array();
 661
 662         for (i = 0; i < content.rows.length; i++) {
 663                 if (content.rows[i].id.match(prefix) &&
 664                                 content.rows[i].className.match("Selected")) {
 665
 666                         var row_id = content.rows[i].id.replace(prefix + "-", "");
 667                         sel_rows.push(row_id);
 668                 }
 669         }
 670
 671         return sel_rows;
 672
 673 }
 674
 675 function toggleSelectRowById(sender, id) {
 676         var row = document.getElementById(id);
 677
 678         if (sender.checked) {
 679                 if (!row.className.match("Selected")) {
 680                         row.className = row.className + "Selected";
 681                 }
 682         } else {
 683                 if (row.className.match("Selected")) {
 684                         row.className = row.className.replace("Selected", "");
 685                 }
 686         }
 687 }
 688
 689 function toggleSelectListRow(sender) {
 690         var parent_row = sender.parentNode;
 691
 692         if (sender.checked) {
 693                 if (!parent_row.className.match("Selected")) {
 694                         parent_row.className = parent_row.className + "Selected";
 695                 }
 696         } else {
 697                 if (parent_row.className.match("Selected")) {
 698                         parent_row.className = parent_row.className.replace("Selected", "");
 699                 }
 700         }
 701 }
 702
 703
 704 function toggleSelectRow(sender) {
 705         var parent_row = sender.parentNode.parentNode;
 706
 707         if (sender.checked) {
 708                 if (!parent_row.className.match("Selected")) {
 709                         parent_row.className = parent_row.className + "Selected";
 710                 }
 711         } else {
 712                 if (parent_row.className.match("Selected")) {
 713                         parent_row.className = parent_row.className.replace("Selected", "");
 714                 }
 715         }
 716 }
 717
 718 function openExternalUrl(url) {
 719         var w = window.open(url);
 720 }
 721
 722
 723 function getRelativeFeedId(list, id, direction) {
 724         if (!id) {
 725                 if (direction == "next") {
 726                         for (i = 0; i < list.childNodes.length; i++) {
 727                                 var child = list.childNodes[i];
 728                                 if (child.id == "feedCatHolder") {
 729                                         if (child.lastChild) {
 730                                                 var cr = getRelativeFeedId(child.firstChild, id, direction);
 731                                                 if (cr) return cr;
 732                                         }
 733                                 } else if (child.id.match("FEEDR-")) {
 734                                         return child.id.replace('FEEDR-', '');
 735                                 }
 736                         }
 737                 }
 738
 739                 // FIXME select last feed doesn't work when only unread feeds are visible
 740
 741                 if (direction == "prev") {
 742                         for (i = list.childNodes.length-1; i >= 0; i--) {
 743                                 var child = list.childNodes[i];
 744                                 if (child.id == "feedCatHolder") {
 745                                         if (child.firstChild) {
 746                                                 var cr = getRelativeFeedId(child.firstChild, id, direction);
 747                                                 if (cr) return cr;
 748                                         }
 749                                 } else if (child.id.match("FEEDR-")) {
 750
 751                                         if (getCookie("ttrss_vf_hreadf") == 1) {
 752                                                 if (child.className != "feed") {
 753                                                         alert(child.className);
 754                                                         return child.id.replace('FEEDR-', '');
 755                                                 }
 756                                         } else {
 757                                                         return child.id.replace('FEEDR-', '');
 758                                         }
 759                                 }
 760                         }
 761                 }
 762         } else {
 763
 764                 var feed = list.ownerDocument.getElementById("FEEDR-" + getActiveFeedId());
 765
 766                 if (direction == "next") {
 767
 768                         if (feed.nextSibling) {
 769
 770                                 var next_feed = feed.nextSibling;
 771
 772                                 while (!next_feed.id && next_feed.nextSibling) {
 773                                         next_feed = next_feed.nextSibling;
 774                                 }
 775
 776                                 if (getCookie("ttrss_vf_hreadf") == 1) {
 777                                                 while (next_feed && next_feed.className == "feed") {
 778                                                         next_feed = next_feed.nextSibling;
 779                                                 }
 780                                         }
 781
 782                                 if (next_feed && next_feed.id.match("FEEDR-")) {
 783                                         return next_feed.id.replace("FEEDR-", "");
 784                                 }
 785                         }
 786
 787                         var this_cat = feed.parentNode.parentNode;
 788
 789                         if (this_cat && this_cat.nextSibling) {
 790                                 while (this_cat = this_cat.nextSibling) {
 791                                         if (this_cat.firstChild && this_cat.firstChild.firstChild) {
 792                                                 var next_feed = this_cat.firstChild.firstChild;
 793                                                         if (getCookie("ttrss_vf_hreadf") == 1) {
 794                                                         while (next_feed && next_feed.className == "feed") {
 795                                                                 next_feed = next_feed.nextSibling;
 796                                                         }
 797                                                 }
 798                                                 if (next_feed && next_feed.id.match("FEEDR-")) {
 799                                                         return next_feed.id.replace("FEEDR-", "");
 800                                                 }
 801                                         }
 802                                 }
 803                         }
 804                 } else if (direction == "prev") {
 805
 806                         if (feed.previousSibling) {
 807
 808                                 var prev_feed = feed.previousSibling;
 809
 810                                 if (getCookie("ttrss_vf_hreadf") == 1) {
 811                                                 while (prev_feed && prev_feed.className == "feed") {
 812                                                         prev_feed = prev_feed.previousSibling;
 813                                                 }
 814                                         }
 815
 816                                 while (!prev_feed.id && prev_feed.previousSibling) {
 817                                         prev_feed = prev_feed.previousSibling;
 818                                 }
 819
 820                                 if (prev_feed && prev_feed.id.match("FEEDR-")) {
 821                                         return prev_feed.id.replace("FEEDR-", "");
 822                                 }
 823                         }
 824
 825                         var this_cat = feed.parentNode.parentNode;
 826
 827                         if (this_cat && this_cat.previousSibling) {
 828                                 while (this_cat = this_cat.previousSibling) {
 829                                         if (this_cat.lastChild && this_cat.firstChild.lastChild) {
 830                                                 var prev_feed = this_cat.firstChild.lastChild;
 831                                                         if (getCookie("ttrss_vf_hreadf") == 1) {
 832                                                         while (prev_feed && prev_feed.className == "feed") {
 833                                                                 prev_feed = prev_feed.previousSibling;
 834                                                         }
 835                                                 }
 836                                                 if (prev_feed && prev_feed.id.match("FEEDR-")) {
 837                                                         return prev_feed.id.replace("FEEDR-", "");
 838                                                 }
 839                                         }
 840                                 }
 841                         }
 842                 }
 843         }
 844 }
 845
 846 function showBlockElement(id) {
 847         var elem = document.getElementById(id);
 848
 849         if (elem) {
 850                 elem.style.display = "block";
 851         } else {
 852                 alert("[showBlockElement] can't find element with id " + id);
 853         }
 854 }
 855
 856 function hideParentElement(e) {
 857         e.parentNode.style.display = "none";
 858 }
 859
 860 function dropboxSelect(e, v) {
 861         for (i = 0; i < e.length; i++) {
 862                 if (e[i].value == v) {
 863                         e.selectedIndex = i;
 864                         break;
 865                 }
 866         }
 867 }
 868
 869 // originally stolen from http://www.11tmr.com/11tmr.nsf/d6plinks/MWHE-695L9Z
 870 // bugfixed just a little bit :-)
 871 function getURLParam(strParamName){
 872   var strReturn = "";
 873   var strHref = window.location.href;
 874
 875   if (strHref.indexOf("#") == strHref.length-1) {
 876                 strHref = strHref.substring(0, strHref.length-1);
 877   }
 878
 879   if ( strHref.indexOf("?") > -1 ){
 880     var strQueryString = strHref.substr(strHref.indexOf("?"));
 881     var aQueryString = strQueryString.split("&");
 882     for ( var iParam = 0; iParam < aQueryString.length; iParam++ ){
 883       if (aQueryString[iParam].indexOf(strParamName + "=") > -1 ){
 884         var aParam = aQueryString[iParam].split("=");
 885         strReturn = aParam[1];
 886         break;
 887       }
 888     }
 889   }
 890   return strReturn;
 891 }
 892
 893 function leading_zero(p) {
 894         var s = String(p);
 895         if (s.length == 1) s = "0" + s;
 896         return s;
 897 }
 898
 899 function center_element(e) {
 900
 901         try {
 902                 var c_width = document.body.clientWidth;
 903                 var c_height = document.body.clientHeight;
 904
 905                 var c_scroll = document.body.scrollTop;
 906
 907                 var e_width = e.clientWidth;
 908                 var e_height = e.clientHeight;
 909
 910                 var set_y = (c_height / 2) + c_scroll - (e_height / 2);
 911                 var set_x = (c_width / 2) - (e_width / 2);
 912
 913                 e.style.top = set_y + "px";
 914                 e.style.left = set_x + "px";
 915         } catch (e) {
 916                 exception_error("center_element", e);
 917         }
 918 }