function booker(){
	var is_4up = parseInt(navigator.appVersion);
	var is_mac = navigator.userAgent.toLowerCase().indexOf("mac")!=-1;
	var is_ie  = navigator.userAgent.toLowerCase().indexOf("msie")!=-1;
	if (is_ie && is_4up && !is_mac) 
		window.external.AddFavorite('http://www.cruzalia.com','CRUZALIA');
}