Shoutbox

I was making replacements for the minimize, maximize and close buttons and I was wondering if you can make the backgrounds of them partly transparent? I know you can make them fully transparent but I just want it so you can see the bcackground through them when you don't have the mouse over it.

Thanks

-UPDATE-
Is there a way where you can have just one colour partly transparent? or does it just have to be the whole thing?

Thanks again