NS4 = (document.layers);
IE4 = (document.all);
ver4 = (NS4 || IE4);   
isMac = (navigator.appVersion.indexOf("Mac") != -1);
isMenu = (NS4 || (IE4 && !isMac));
if (!ver4) event = null;

function bookmark(bookmarkurl,bookmarktitle){
if (document.all)
window.external.AddFavorite(bookmarkurl,bookmarktitle)
}