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 = function() {
    externalLinks();
    
    $("#menu>li").mouseover(function(){ 
      $(this).addClass("over");
    }).mouseout(function(){
      $(this).removeClass("over");
    });

}