function Next()
	{
		if(window.document.frmMMB.bookingref.value == '')
		{
			alert('Please enter your booking reference number. This was provided to you when you booked originally');
			return;
		}
		if(window.document.frmMMB.surname.value == '')
		{
			alert('Please enter the surname of any person travelling on this booking');
			return;
		}
		
		window.document.frmMMB.action = "mmb-options.asp";
		window.document.frmMMB.submit();	
	}