Quick question re: slicing PSD files.

I have a .psd ready that i need to slice up however, in the .psd i have a user/password login box (kind of like an affiliate login) how would i go about slicing the image in such a way that this login box remains intact so i can actually put a form call in it?

Anyone happen to know?

I have done the Google thing and cant find the answer

Regards,

Lee