fenster=null;
var n;

function zu(){if (fenster != null) if (!fenster.closed) fenster.close();}

function oeffnefenster (myurl,w,h)
{
 zu();
 
 var w1 = "width=" + (w+0) + ",height=" + (h+0);
 fenster = window.open(myurl, "fenster1", w1, "status=yes,scrollbars=yes,resizable=yes");
 

 

 
 
 fenster.focus();
}