<script language="JavaScript">
function winopen(url,popUpSizeX,popUpSizeY,popUpLocationX,popUpLocationY){
splashWin = window.open("",'x','fullscreen=1,toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=no,resizable=0');
splashWin.blur();
window.focus();
splashWin.resizeTo(popUpSizeX,popUpSizeY);
splashWin.moveTo((screen.width-XXX)/2,(screen.height-XXX)/2);
splashWin.location=url;
splashWin.focus();
}
</script>
XXX=breite und höhe in pixel
winke
sangria