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','toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,width=720,height=470,top=110,left=110')
}