Generic validator for integer value ranges (value-from - value-to).
Will return FALSE if value2 < value1, requires two custom attributes named "value1" and "value2",
representing the field names of the two recordset fields to use
in the validation logic. Returns TRUE if any of the parameters is null.
Creation date: 3/march/2004
Last Update: 3/march/2004
(c) 2004 Martin Cordova
This code is released under the LGPL license
author: Martin Cordova (dinamica@martincordova.com)