function goPop(vURL,winName,width,height) {

  var winl = (screen.width - width) / 2;
  var wint = (screen.height - height) / 2;

  features = 'width='+width+',height='+height+',top='+wint+',left='+winl+',toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no'

new_window = window.open(vURL, winName, features);
new_window.focus();
}