function open_3d_demo_window(url,wi,hi) {
	 var s = window.open(url,'','fullscreen=0,toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=1')
		var w = 800, h = 600;
		if (document.all || document.layers) {
		   w = screen.availWidth;
		   h = screen.availHeight;
		}
	sirkaOk=wi;
	vyskaOk=hi;
	s.resizeTo(sirkaOk,vyskaOk);
		if((h-vyskaOk)/2<0) s.moveTo((w-sirkaOk)/2,0);
		else s.moveTo((w-sirkaOk)/2,(h-vyskaOk)/2);
		s.focus();
}