function getTrackingCode(href){
    return "_gaq.push(['_setAllowHash', false]);_gaq.push(['_setAllowLinker', true]);_gaq.push(['_link','"+href+"']); return false;";
}

document.observe("dom:loaded", function(){

    var links=$$("a");
        links.each(function(a){ 
            var href=a.getAttribute("href");
            domains.each(function(i){
          
                if(href.indexOf(i)!=-1){
                    
                    a.setAttribute("onclick",getTrackingCode(href));
                }
            });
        });
});