wp-signup.php background; redirect

Hi:

I bet this is a simple answer for a Prosites (Supporter) issue but I haven't been able to crack it and any help would be greatly appreciated:

Issue #1: wp-signup.php is inheriting the background of the home page, and I want it to inherit the background of the non-home pages.

Issue #2: my http://www.site.com URL directs to the correct home page but site.com directs to the wp-signup.php page and I would like them both to direct to the home page.

Again, I bet these are basic questions by my undying gratitude if someone could humor me.

Thanks!