This validator returns FALSE if the corresponding field
cannot be parsed as a valid time with format HH:mm
If parameter's value is NULL then the validator returns TRUE
Requires the following custom attributes:
parameter: Name of the request parameter to validate. This parameter
MUST be defined in validator.xml.
(c) 2005 Martin Cordova
This code is released under the LGPL license
Dinamica Framework - http://www.martincordova.com
author: Martin Cordova (dinamica@martincordova.com)