if(document.URL.search(/www.vthk.de/) != "-1") {

   if(document.URL == "http://www.vthk.de/") {
   counter("count_std.cnt");
   }
   if(document.URL == "http://www.vthk.de/index.php") {
   counter("count_std.cnt");
   }
   if(document.URL == "http://www.vthk.de/vthk_plz.php") {
   counter("count_plz.cnt");
   }
   if(document.URL == "http://www.vthk.de/vthk_bila.php") {
   counter("count_bil.cnt");
   }
   if(document.URL == "http://www.vthk.de/vthk_weit.php") {
   counter("count_wei.cnt");
   }
   if(document.URL == "http://www.vthk.de/en/index.php") {
   counter("count_en_std.cnt");
   }
   if(document.URL == "http://www.vthk.de/en/vthk_plz.php") {
   counter("count_en_plz.cnt");
   }
   if(document.URL == "http://www.vthk.de/en/vthk_bila.php") {
   counter("count_en_bil.cnt");
   }
   if(document.URL == "http://www.vthk.de/en/vthk_weit.php") {
   counter("count_en_wei.cnt");
   }
   //alert(document.URL);
}

function counter(datei) {
document.write('<img src="http://www.dombibliothek-koeln.de/cgi-bin/img_counter.cgi?'+datei+'" alt="[Counter]" title="Seitenaufrufe">');
}