Conditional Background Colour of Text-Fields

Hello Everybody,

I am new in Adobe Forms and I have a problem in formatting background colour of a text-field in my form.

I have designed in my form a calender.

Every day is a text-field. Now I want to set the background colour to grey if the field is a sunday.

Now my question is this possible only with scripting?

Could you give me some help?

Thanks a lot

Sigi