Calendar functionality for VA in webUI

Folks,

I'm attempting to create a new tab in our webUI that will include a VA with calendar functionality. What I want is to have the new VA behave the same as the Account Expires field in the webUI. When that field is clicked a calendar form popup appears and the field is populated from the date chosen. I don't need date/time, just date (but I could easily work with date/time).

Any ideas/instructions on how to create this function? I found out that our team doesn't use the existing[b] expirationTime [/b]attrib in AD or Exchange, and inputing that field in the webUI creates the calendar perfect ... but ... I don't want to use an existing attrib for fear it might potentially cause conflicts.

Ideas?

Thanks - Greg