Input Mask in Frontpage Forms

[kdkat]

I've used the Frontpage Database wizard to create a simple membership
database, and have created some FP forms to add/edit/delete the info in this
database. My problem is that on the FP form I am unable to figure out how to
limit the one field called Start Date to enter the Date format that I
require. It is simply a text box, with no constraints. I want to limit the
field to accept only MM/YY - Any advice would be greatly appreciated.
Thanks in Advance
Katherine