function wopen(url, name, w, h) {
	
	// Fudge factors for window decoration space.
	w += 32;
	h += 96;
 	
	wleft = (screen.width - w) / 2;
	wtop = (screen.height - h) / 2;
	
	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');

	// Just in case width and height are ignored
	win.resizeTo(w, h);

	// Just in case left and top are ignored
	win.moveTo(wleft, wtop);
	win.focus();

}