// Open game window
function wopen(url, name, w, h) {
	w += 32;
	h += 96;
	wleft = (screen.width - w) / 2;
	wtop = (screen.height - h) / 2;
	if (wleft < 0) {
		w = screen.width;
		wleft = 0;
	}
	if (wtop < 0) {
		h = screen.height;
		wtop = 0;
	}
	var win = window.open(url,
	name,
	'width=' + w + ', height=' + h + ', ' +
	'left=' + wleft + ', top=' + wtop + ', ' +
	'location=no, menubar=no, ' +
	'status=no, toolbar=no, scrollbars=no, resizable=no');
	win.resizeTo(w, h);
	win.moveTo(wleft, wtop);
	win.focus();
}