allLinks = document.getElementsByTagName("a");
// If there are links
if (allLinks.length > 0)
{
  for (i = 0; i < allLinks.length; i++)
  {
     var pos = allLinks[i].href.indexOf("go64.com");
     if ( pos != -1)
     {
       var old_href = allLinks[i].href;
       allLinks[i].href = old_href.substring(0,pos) + "gamevortex.com" + old_href.substring(pos+8);
     }
  }
}