var f=null;
function popUp(url,w,h,left,top,name) {
 var options="width="+w+",height="+h+",left="+left+",top="+top+",scrollbars=yes";
 if(f==null) {
   document.bild.src=name;
   f=window.open(url,"popup",options);
 }
 else {
   f.close();
   f=null;
   document.bild.src=name;
 }
 return;
}

function bildwechsel(Bildnr,name) {
  window.document.images[Bildnr].src = name;
}