function image_popup(url, x, y)
{
	if (x < 500) {
		x = 500;
	}
	var w = x + 40;
	var h = y + 60;
	var left_pos = 0;
	var top_pos = 0;
	if (screen) {
		left_pos = (screen.width / 2) - (w / 2);
		top_pos = (screen.height / 2) - (h / 2);
	}
	var popup = window.open(url, '', 'menubar=0,scrollbars=1,resizable=no,width=' + w + ',height=' + h + ',left=' + left_pos + ',top=' + top_pos);
	popup.focus();
	//return null;
}