dreamweaver: very dumb question

[Chiclevic]

I feel very dumb asking this, Im kinda new in Dreamweaver, Ive always worked with flash. But now Ive been asked to do a website, but it needs to be done in Dreamweaver for the updates....anyway, my problem is I already created a menu (Spry Menu Bar), and I want the principal buttons, to have a transparent background...so I did, the problem are the menu items, I want THEM to have a background color. But I dont know how, because when I change one thing, the change goes for everything.
Here I put 2 examples, and how my dreamweaver menu thing is looking

Thanks a lot