function open_window(url)
{
ww = 820;
hw = 581;
w = parseInt(screen.width);
h = parseInt(screen.height);
w2 = (w-ww)/2;
h2 = (h-hw)/2;
theOpts="toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1,width="+ww+",height="+hw+",screenX="+w2+",screenY="+h2+",left="+w2+",top="+h2;
mywin = window.open(url,"mss_",theOpts);
if ( ! document.all ) {
        mywin.captureEvents(Event.BLUR);
        mywin.onBlur = catchBlur;
}
mywin.resizeTo(ww,hw);
mywin.focus();
}
function catchBlur(Ereignis)
{
if ( ! document.all ) mywin.focus();
else mywin.close();
}



function closead() {
  document.getElementById('ad').style.visibility='hidden';
}

function close_ballgrid() {
  document.getElementById('ballgrid').style.visibility='hidden';
}