CMS Made Simple Forums

I *think* you must compare the values and return false if they don't match, and true if they do.

I don't know a solution, but I think you should do it that way. Never did it myself.

Under tab Form Submission you can choose the 'User defined tag to call during form validation'

Then you must know how to read the fields (I suppose they are passed to the UDT) and do your compare-thing.