if (!document.getElementById)
document.getElementById = function() { return null; }

function initializePopup(popupId) {
    var popup = document.getElementById(popupId);
    var popPage = "popup/" + popupId + ".html";
    popup.onclick = function() {
        window.open (popPage,'popup','width=480,height=550,toolbar=1,scrollbars=1,resizable=1');
        return false;
        }

}