var hostname = window.location.hostname.replace("www.", "").toLowerCase();
var i = document.links.length;
while ( --i >= 0 ) {
var thisLink = document.links[i];
var thisHref = thisLink.href.toLowerCase();
if ( thisHref.indexOf("http://") != -1 && thisHref.indexOf(hostname) == -1)
{
thisLink.target = '_blank';
thisLink.className = 'external';
}
}