window.onload = function() {

	if (!document.getElementsByTagName) {
		return false; 
	} 

	var popuplinks = document.getElementsByTagName("a");

	for (var i=0; i < popuplinks.length; i++) {	
		// if the link has a class of "popup"...	
		if (popuplinks[i].getAttribute("class") == "popup") {		
			popuplinks[i].onclick = function() {	
				openPopUp(this.getAttribute("href"));	
				return false; 	
			} 	
		}
	} 
} 

function openPopUp(linkURL) {
window.open(linkURL,'popup','width=750,height=500,scrollbars,menubar')
}