var txt = "Art For Rent zu meinen Favoriten hinzufügen (klick)"
var url = "http://www.artforrent.de"
var who = "Art For Rent - Kunst leasen oder mieten"
var ver = navigator.appName
var num = parseInt(navigator.appVersion)
if ((ver == "Microsoft Internet Explorer")&&(num >= 4)) {
   document.write('<a href="javascript:window.external.AddFavorite(url,who);"');
   document.write('>'+ txt + '</a>')
}else{
   document.write('Tipp: Fügen Sie Art For Rent Ihren Favoriten hinzu.');
}