function agregar(){
   if ((navigator.appName=="Microsoft Internet Explorer") && 
         (parseInt(navigator.appVersion)>=4)) {
      var url="http://www.youthey.com/"; 
      var titulo="Gente YouThey.com";
      window.external.AddFavorite(url,titulo);
   } else { 
      if(navigator.appName == "Netscape") 
         alert("Presione Crtl+D para agregar este sitio en sus Bookmarks"); 
   }
}

function launchTellFriend ()
{
	var left = (screen.width/2) - 300/2;
	var top = (screen.height/2) - 300/2;
    var win = "width=350,height=220,left=" + left + ",top=" + top + ",copyhistory=no,directories=no,menubar=no,location=no,resizable=yes,scrollbars=yes";
    window.open("http://www.youthey.com/tellafriend.php",'tellfriend',win);
}