window.onload = function() {	
// check to see that the browser supports the getElementsByTagName method	// if not, exit the loop 	
if (!document.getElementsByTagName) {		
return false; 	} 
// create an array of objects of each link in the document 	
var popuplinks = document.getElementsByTagName("a");	
// loop through each of these links (anchor tags) 		
for (var i=0; i < popuplinks.length; i++) {			
// if the link has a class of "popup"...			
if (popuplinks[i].getAttribute("class") 
== "popup") {				
// add an onclick event on the fly to pass the href attribute				
// of the link to our second function, openPopUp 				
popuplinks[i].onclick = function() {				
openPopUp(this.getAttribute("href"));				
return false; 				
} 			
}	
} 
} 
function openPopUp(linkURL) {	window.open(linkURL,'popup','width=1010,height=630')}