jQuery Datepicker - Can it Display Only the 1st and 15th of Each Month?

Hi, again.

I've sold my boss on the jQuery datepicker, but he's getting a little picky. He insists on me finding a way to have the pop-up calendar display only the 1st and 15th of each month. Please tell me: Is there any way to disable every day but the 1st and 15th?

Thanks in advance for any help you will offer.