function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if (anchor.getAttribute("href") &&
       anchor.getAttribute("rel") == "external")
     anchor.target = "_blank";
 }
}
window.onload = externalLinks;

<!--
function popup(url) 
{
 params  = 'width=1300';
 params += ', height='+screen.height;
 params += ', top=0, left=0'
 params += ', scrollbars=yes'
 params += ', fullscreen=yes';

 newwin=window.open('about:blank','searchPopup', params);
 if (window.focus) {newwin.focus()}
 return false;
}
function closeWin()
{
window.close();
}
-->