title: Javascript problem with a global external link confirmation alert
body: <p>Below is the code from a plugin for Joomla. It works on it's own and it's purpose is to detect external links on the page and force them into new browser windows using _blank.</p>
  
  <p>I've tried for about an hour (I don't know javascript well) but I can't seem to figure out how to get an onclick function working.</p>
  
  <p>End result, I want to add to this script the ability of a confirmation dialog, shown in the 2nd code section.</p>
  
  <p>An external link, when clicked, will pop up the confirmation dialog, and if it says yes, they will be able to get to the external URL, opening in a new window. Otherwise, it cancels, and does nothing.</p>
  
  <p>When I create a link with <pre>onclick="return ExitNotice(this.href);"</pre> within it it works perfectly, but since my website has multiple people submitting input, I'd like the confirmation box global.</p>
  
  <pre><code>this.blankwin = function(){
    var hostname = window.location.hostname;
    hostname = hostname.replace("www.","").toLowerCase();
    var a = document.getElementsByTagName("a");   
    this.check = function(obj){
      var href = obj.href.toLowerCase();
      return (href.indexOf("http://")!=-1 &amp;&amp; href.indexOf(hostname)==-1) ? true : false;              
    };
    this.set = function(obj){
      obj.target = "_blank";
      obj.className = "blank";
    };    
    for (var i=0;i&lt;a.length;i++){
      if(check(a[i])) set(a[i]);
    };        
  };
  
  this.addEvent = function(obj,type,fn){
    if(obj.attachEvent){
      obj['e'+type+fn] = fn;
      obj[type+fn] = function(){obj['e'+type+fn](window.event );}
      obj.attachEvent('on'+type, obj[type+fn]);
    } else {
      obj.addEventListener(type,fn,false);
    };
  };
  addEvent(window,"load",blankwin);
  </code></pre>
  
  <p>Second Part</p>
  
  <pre><code>/* ----------
    OnClick External Link Notice
  ---------- */
  function ExitNotice(link,site,ltext) {
    if(confirm("-----------------------------------------------------------------------\n\n" + 
      "You're leaving the HelpingTeens.org website. HelpingTeens.org\ndoes not " + 
      "control this site and its privacy policies may differ\nfrom our own. " + 
      "Thank you for using our site.\n\nYou will now access the following link:\n"  + 
      "\n" + link + "\n\nPress \'OK\' to proceed, or  press \'Cancel\' to remain here." + 
      "\n\n-----------------------------------------------------------------------")) 
    {
    return true;
  } 
  history.go(0);
  return false;
  }
  </code></pre>
  
  <p>A) Can anyone help me fix this problem?
  or B) Is there a better solution?</p>