function bookmark(){
		var url = "http://www.macmanus.co.uk";
		var who = "www.macmanus.co.uk";
		var ver = navigator.appName;
		var num = parseInt(navigator.appVersion);
		var netscape="Netscape User's hit CTRL+D to add a bookmark to this site.";
		if ((ver == "Microsoft Internet Explorer")&&(num >= 4)) {
			window.external.AddFavorite(url,who);
		}else{
		  alert(netscape);
		}
	}