function doPopup() {
if (!document.getElementsByTagName) return false;
var links = document.getElementsByTagName("a");
for (var i=0; i < links.length; i++) {
if (links[i].className.match("popup")) {
links[i].onclick = function() {
window.open(this.href,"popup", 'width=520, height=320, menubar=no, toolbar=no, scrollbars=yes');
return false;
}
}
}
}
window.onload = doPopup;