Returns TRUE if value1.equals(value2).
value1 and value2 must be of type String. Requires two custom
attributes named "value1" and "value2" representing the names
of the fields to compare.
Creation date: 5/03/2004
Last Update: 5/03/2004
(c) 2004 Martin Cordova
This code is released under the LGPL license
author: Martin Cordova (dinamica@martincordova.com)