/************************************
 *
 * 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 = 
   [
    '*.thomasnet-navigator.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) {		_gaq.push(['_link', (link_href)]);		return false;}