function popup(url,name,options)
{
  var fenster = window.open(url,name, 'resizable=no,scrollbars=yes,width=550,height=350');
  var hoehe = screen.availHeight;
  var breite = screen.availWidth;
  fenster.moveTo(Math.round((breite-550)/2),Math.round((hoehe-350)/2));
  fenster.focus();
}


function popupzei(url,name,options)
{
  var fenster = window.open(url,name, 'resizable=no,scrollbars=yes,width=850,height=450');
  var hoehe = screen.availHeight;
  var breite = screen.availWidth;
  fenster.moveTo(Math.round((breite-850)/2),Math.round((hoehe-450)/2));
  fenster.focus();
}

function popupzei2(url,name,options)
{
  var fenster = window.open(url,name, 'resizable=no,scrollbars=yes,width=700,height=450');
  var hoehe = screen.availHeight;
  var breite = screen.availWidth;
  fenster.moveTo(Math.round((breite-700)/2),Math.round((hoehe-450)/2));
  fenster.focus();
}

function popscroller(url,name,options)
{
  var fenster = window.open(url,name, 'resizable=no,scrollbars=yes,width=510,height=590');
  var hoehe = screen.availHeight;
  var breite = screen.availWidth;
  fenster.moveTo(Math.round((breite-510)/2),Math.round((hoehe-590)/2));
  fenster.focus();
}