function popup(seite,param) {
   if(!param) {
     param = 'width=550, height=400';
   }
   var win = window.open(seite,'popup',param);
   win.focus();
}

function openexternal(seite) {
   var win = window.open(seite,'popup','width=760, height=560, scrollbars, location, menubar, status');
   win.focus();
}