window.onload = function (){ 
var node_a = document.getElementsByTagName('a'); 
for (var i in node_a) { 
if(node_a[i].className == 'popup'){ 
node_a[i].onclick = function() { 
return winOpen(this.href, this.rel) 
}; 
} 
} 
} ; 
function winOpen(url, rel) { 
var split = rel.split(',') ; 
window.open( url,'popup', 'width='+ split[0] +',height='+ split[1] +',toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no'); 
return false; 
};