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=850,height=650,scrollbars=yes,toolbar=yes,resizable=yes')
			}