var wstat
var ns4up = (document.layers) ? 1 : 0
var ie4up = (document.all) ? 1 : 0
var xsize = screen.width
var ysize = screen.height
var breite=480
var hoehe=480
var xpos=(xsize-breite)/2
var ypos=(ysize-hoehe)/2
function opwin(URL) {
wstat=window.open(URL,"","scrollbars=yes,status=no,toolbar=no,location=no,directories=no,resizable=no,menubar=no,width="+breite+",height="+hoehe+",screenX="+xpos+",screenY="+ypos+",top="+ypos+",left="+xpos)}
function closewin() {wstat.close()}