var popupFenster;
function dataFensterAuf(url, name, rs, w, h) {  
if (popupFenster == null || popupFenster.closed)	{
var resize = "";  if (rs) {    
resize = "resizable,";  }  
popupFenster = window.open(url, name, 'scrollbars,status,' + resize +'width=' + w + ',height=' + h);
}
else	{
popupFenster.location.href = url;
}
popupFenster.focus();
}