function popup(url) {
   var w = window.open(url, '_blank','toolbar=yes,location=yes,status=yes,menubar=yes,scrollbars=yes,resizable=yes,height=650,width=625');
   w.focus();
 }

function popup(url, width, height) {
  var w = window.open(url, '_blank','toolbar=yes,location=yes,status=yes,menubar=yes,scrollbars=yes,resizable=yes,height='+height+',width='+width+'');
  w.focus();
}