function OpenSimpleBooking(Lang, Type, OptionalGuid)
{
	var Guid = '778D7DEB-5013-45BC-87C4-D81C7E7FE609';
	if(OptionalGuid != null) { Guid = OptionalGuid; }
	if(Guid != null && Guid != '')
	{
		var wndParams = 'scrollbars=no,resizable=yes,location=no,menubar=no,status=no,width=630,height=400';
		var Url = 'https://www.simplebooking.it/booking.aspx';
		Url += '?GUID=' + Guid;
		Url += '&LANG=' + ((Lang != null && Lang != '') ? Lang : 'EN');
		if(Type != null) { Url += '&DO=' + Type; }
		window.open(Url, 'OnlineBooking', wndParams);
	}
	else { alert('Please specify a valid GUID.'); }
}