/************************************
 *
 * Automatically tag links for Google Analytics to
 * simplify tracking across domains. 
 *
 * Peter McKenna
 * peter.mckenna@iqcontent.com
 * 
 * v1. Initial script
 *
 ************************************/

// Config Variables.
var domains_to_track = 
  [
   '*.gm2labs.com',
   '*.buymelanotanii.com' 
  ];

// Get all the links on the page (could be slow for pages with lots of links)
var links = document.getElementsByTagName("a");
// Loop through links
for(i=0;i<links.length;i++) {
  // Get the target for link
  var link_target = links[i].host;
  // Loop through domains to track
  for (j=0;j<domains_to_track.length;j++) {
    var wildcard_domain = -1;
    // Check for wildcard domain (e.g. *.somedomain.com)
    if (domains_to_track[j].substr(0,1)=='*') {
      wildcard_domain = domains_to_track[j].substr(2,(domains_to_track[j].length-1));
    }
    // Checks if domain should be tracked
    if(link_target==domains_to_track[j]||
       link_target==domains_to_track[j]+':80'||
       link_target.indexOf(wildcard_domain)>=0) {
           links[i].onclick = 
        function() {
          // Run tagLink function when link is clicked
          return tagLink(this.href);
        }
    }
  }
}

// This function is called when a tracked link is clicked
function tagLink(link_href) {
  // Check if pageTracker or urchinTracker are present
  if (typeof pageTracker != 'undefined') {
    pageTracker._link(link_href);
    return false;
  }
  else if (typeof urchinTracker != 'undefined') {
    __utmLinker(link_href);
    return false;
  }
  else {
    return true;
  }
}