Insert class links from remote location

class-links.js

// ==UserScript==
// @name           Insert class links from remote location
// @namespace      http://www.duncanandmeg.org/
// @description    Pulls down links from one of my instapaper.com folder RSS feeds and inserts them into a page. Let him who understandeth modify to his own satisfaction!
// @author          Duncan Johnson
// @include          http://home.bju.edu/
// @include          https://home.bju.edu/
// ==/UserScript==

/*
 * --------------------------------------------------------------
 * USER EDIT: paste your feed URL in the line below
 * --------------------------------------------------------------
 */
var feedURL = "http://www.instapaper.com/folder/48337/rss/11185/QBV0RZfH4KBO7GwgrR3D8b7sv90";

/*
 * --------------------------------------------------------------
 * USER EDIT: Do not edit any code below this comment...
 * --------------------------------------------------------------
 */
// Add jQuery
var GM_JQ = document.createElement('script');
GM_JQ.type = 'text/javascript';
GM_JQ.src = 'http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js';
document.getElementsByTagName('head')[0].appendChild(GM_JQ);

// All your GM code must be inside this function
function letsJQuery() {
  GM_xmlhttpRequest({
    url: feedURL,
    method: "GET",
    onload: function (responseObject){
      var data = responseObject.responseText;
      data = data.replace(/link>/g,"url>"); //necessary because jQuery arfs the </link> tag for some reason
      
      var classString = "";
      
      $("item",data).each(function (i) {
        var link = $("url",this).text();
        (link.match(/\.doc/)) ? img = "<img src='http://home.bju.edu/images/doc.gif'/>" : img = "";
        classString = classString + "<li><a href='" + link + "'>" + $("title",this).text() + "</a> " + img + "</li>";
      });
      
      GM_setValue ("classStringCached", classString); //cache string for offline use
      
      var message = "<div id='classes'><h2>Class Links</h2><ul>" + classString + "</ul></div>";
      if ($("#sidelinks #classes").length === 0) { $("#sidelinks").prepend(message); }
    },
    onerror: function () {
      var classString;
      if (typeof(GM_getValue("classStringCached")) === "undefined") {
        classString = "<p>Sorry! There was an error accessing your class link information. We will try again the next time you view this page.</p>"; //polite total fail message 
      } else {
        classString = "<ul>" + GM_getValue("classStringCached") + "</ul>"; //access cached classString value
      }
      if ($("#sidelinks #classes").length === 0) { $("#sidelinks").prepend("<div id='classes'><h2>Class Links</h2>" + classString + "</div>"); }
    }
  });
}

// Check if jQuery's loaded
function GM_wait() {
  if(typeof unsafeWindow.jQuery == 'undefined') { window.setTimeout(GM_wait,100); }
  else { $ = unsafeWindow.jQuery; letsJQuery(); }
}
GM_wait();