function popupWindowFix( URL ) 
{
	popupWindow( URL, 420, 380, true );
}

function popupWindow( URL, breite, hoehe, allowresize )
{
	popupWindowCommon( URL, breite, hoehe, allowresize, false );
}

function popupWindowCommon( URL, breite, hoehe, allowresize, scrollbars ) 
{
	sw = (screen.width - breite) / 2;
  sh = screen.height / 2 - 175;

  popup = window.open(URL,"popupwindow","toolbar=no,menubar=no,location=no,directories=no,status=no,scrollbars="+ (scrollbars?"yes":"no") +",resizable="+ (allowresize?"yes":"no") +",copyhistory=no,width="+breite+",height="+hoehe+",screenX="+sw+",screenY=20,left="+sw+",top=20");
	popup.focus();
}