function open_window(url, w, h)
{
	// To center popup window
	var l = parseInt((screen.width - w) / 2);
	var t = parseInt((screen.height - h) / 2);
	var parameters = 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=1,width=' + w + ',height=' + h + ',left=' + l + ',top=' + t;
	window.open(url, 'PopUpWindow', parameters);
}