pastebin - collaborative debugging

// Google Reader Preview
// version 0.1
// 2006-16-11
// Copyright (c) 2006, Itai Lahan
// Released under the GPL license
// http://www.gnu.org/copyleft/gpl.html
// --------------------------------------------------------------------
// WHAT IT DOES:
// Replaces Google Reader's article summary with a frame containing the actual blog item
// --------------------------------------------------------------------
// ==UserScript==
// @name            Google Reader Preview
// @description     Replaces Google Reader's article summary with a frame containing the actual blog item
// @include         http://reader.google.com/reader/*
// @include         http://www.google.com/reader/*
// ==/UserScript==

document.getElementsByClassName = function(className, parentNode) {
  var elements = [];
  var parent = parentNode;
  if (parentNode == undefined) {
          parent = document.body;
  }
  if (parent.getElementsByTagName == undefined) {
          return elements;
  }
  var children = parent.getElementsByTagName('*');
  for (var i = 0; i < children.length; i ++) {
        var child = children[i];
    if (child.className.match(new RegExp("(^|\\s)" + className + "(\\s|$)"))) {
      elements[elements.length] = child;
        }
  }
  return elements;
}

var decorate_new_elements = function(e) {
        var element = e.target;
        if (element.className != "entry-container") {
                return;
        }
        var elements = document.getElementsByClassName("entry-title", element);
        if ((elements == undefined) || (elements.length == 0)) {
                return;
        }
        var entry_title = elements[0];
        var href_array = /\"(http:\/\/[^\"]*)\"/.exec(entry_title.innerHTML);
        if (href_array == undefined || href_array.length == 0) {
                return;
        }
        var href = href_array[1];

        elements = document.getElementsByClassName("entry-body", element);
        if (elements != undefined && (elements.length > 0)) {
                var body = elements[0];
                // Turn off preview for URLs that match the strings below.
                if (
                        href.lastIndexOf("foo")==-1 &&
                        href.lastIndexOf("foo2")==-1 &&
                        href.lastIndexOf("foo3")==-1 &&
                        href.lastIndexOf("foo4")==-1
                )
                {
                body.innerHTML = "<IFRAME src='"+href+"' height=500 width=1000></IFrame>";
                }
        }
}

document.body.addEventListener('DOMNodeInserted', decorate_new_elements, false);