Date Picker - need help

[brainwill]

Couple days ago i downloaded a date picker from [a href=\"http://www.kodart.com\" target=\"_blank\"]http://www.kodart.com[/a]
so far i'm very much please how it works and looks, but still i wanna add some new features to it like pop-up notes to dates, new background and so on.
i would really appreciate if anyone would tell me how to do that. there is something like a sourc page on [a href=\"http://www.kodart.com\" target=\"_blank\"]http://www.kodart.com[/a] main page, but since i'm dull in programmin i can tell nothing what it can be.

thanks in advance!