function changeimage(obj, img){
   if (document.images) {
      obj.src = img;
   }
}

function login(url) {
   var win = window.open(url, "fenster1", "width=580,height=745,status=yes,scrollbars=yes,resizable=yes");
   win.focus();
}

function mplogin(url) {
   var win = window.open(url, "fenster2", "width=550,height=370,status=yes,scrollbars=yes,resizable=yes");
   win.focus();
}

function imprint(url) {
   var win = window.open(url, "fenster3", "width=330,height=200,status=no,scrollbars=no,resizable=no");
   win.focus();
}