var popupjs_func = function() {
	var node_a = document.getElementsByTagName('a');
		for (var i in node_a) {
			if (node_a[i].className == 'popup') {
				node_a[i].onclick = function() {
					return winOpen(this.href)
				};
			}
		}
};

if (window.addEventListener) window.addEventListener('load', popupjs_func, false);
if (window.attachEvent) window.attachEvent('onload', popupjs_func);

function winOpen(url) {
	window.open(
	url,'popup',
	'width=600,height=600,scrollbars=1,resizable=1');

	return false;
};