var fenster;

function banking(url){
  
  	var top, left, width=796, height=545;

  	top  = Math.round((screen.height - height)/0);
  	left = Math.round((screen.width - width)/0);


  	fenster = window.open(url, 'Meldung', 'width='+width+',height='+height+',left='+left+',top='+top+',scrollbar=no');
  	fenster.focus();

}