Can I tie a validator to two controls at once?

Hello,

I have two dropdown controls on a form, representing a month/year combination. The date entered must be in the future, so I wrote a custom validator to check this. Trouble is, the validator is only tied to one control (currently the month dropdown), which means that the validation isn't fired when the other control's value changes.

Is there a way of getting the client-side validation code to fire when either one of two controls is changed? TIA

--
Alan Silver
(anything added below this line is nothing to do with me)
.

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