function addbookmark(whichPage, bookmarktitle)
{
	bookmarkurl = "http://www.fl-online-ed.org/" + whichPage;
	var is_mac = (navigator.userAgent.toLowerCase().indexOf("mac")!=-1);
	//alert(navigator.userAgent.toLowerCase() + " " + is_mac);
	var ver = navigator.appName
	var num = parseInt(navigator.appVersion)
	if(ver == "Microsoft Internet Explorer"&&num >= 4 && !is_mac)
		window.external.AddFavorite(bookmarkurl,bookmarktitle);
	else
   		alert("Please press Ctrl+D or Apple+D.");
}