function popup(type, url) {
 var fenster;
 if (type == "suggestion") {
  fenster=window.open(url, type, "width=590,height=600,resizable=no, left=160, top=30, location=no, menubar=yes, scrollbars=no");
 } else if (type == "subscription") {
  fenster=window.open(url, 'Subscription', 'width=570,height=500,toolbar=1,location=0,directories=0,status=0,menuBar=0,scrollBars=1,resizable=1,location=0');
 } else {
  fenster=window.open(url, type, "width=590,height=550,resizable=no, left=160, top=30, location=no, menubar=yes, scrollbars=yes");
 } 
 fenster.focus();
 return false;
}