function doPopups() {
if (!document.getElementsByTagName) return false;
 var links = document.getElementsByTagName("a"); 
 for (var i=0; i < links.length; i++) { 
  if (links[i].className.match("popup")) { 
    links[i].onclick = function() { 
   window.open(this.href,"JANELA", "height = 320, width = 430"); 
   return false; 
  } 
 } 
} 
} 
window.onload = doPopups;