function popup( url, w, h )
{
  if( w!="" && h!="" )
   {
		fenster = window.open( url, "popup","resizable=no,toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,width="+w+",height="+h );
		fenster.focus();
	}
	else
	{
	    fenster = window.open( url,"popup","resizable=yes,toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=auto,width=500,height=400" );
		fenster.focus();
	}

}