var theToolBox = "The ToolBox";
var hostname = "http://" + window.location.hostname;

var ver = navigator.appName;
var num = parseInt(navigator.appVersion);

if((ver == "Microsoft Internet Explorer")&&(num >= 4)){
document.write('&bull; <a href="javascript:window.external.AddFavorite(hostname,theToolBox);">BookMark the ToolBox!</a>');
}