bookmark, addfavourite IE a FF problem

<a href="#" title="Set as homepage" onClick="this.style.behavior='url(#default#homepage)';this.setHomePage('http://www.xxxxxx.com/');">Set as homepage</a>

<a href="#" title="Bookmark this page" rel='sidebar' onclick='return AddFavorite(this,document.location.href,document.title);'>Bookmark this page</a>

<a href="#" onclick="window.external.AddFavorite('http://www.jakpsatweb.cz/', 'Jak psát web');return false">Přidat k oblíbeným</a>

<script>
<!--
nazov = navigator.appName;
netscape = (nazov == "Netscape");
explorer = (nazov == "Microsoft Internet Explorer");

if (netscape)
{
   <a href="#" title="Bookmark this page" rel='sidebar' onclick='return AddFavorite(this,document.location.href,document.title);'>Bookmark this page</a>;
}
if (explorer)
{
 <a href="#" onclick="window.external.AddFavorite('http://www.iomdirectholidays.com/', 'www.iomdirectholidays.com');return false">Bookmark this page</a>;
}
// -->
</script>

<script language="JavaScript">
<!--
   var typ_browsera;

   function aky_typ_browsera()
   {
      if( navigator.appVersion.indexOf("MSIE") != -1 )
         typ_browsera = "IE";
      else
         if( navigator.appName == "Netscape" )
            typ_browsera = "Netscape";
         else
            typ_browsera = "Other";
   }
//-->
</script>