How can i change the font-weight on titles?

Hi, I'd like to change the font-weight from BOLD to NORMAL for the following:

1. Category box listing (center column category titles )
2. New items listings (center column)

I played with the "a: link" & "a:hover" in the stylesheet, but that ended up taking away ALL the bolds on every link, which i don't want. I'd like to keep the log-in/sign-in links bolded.

How would i change this on the stylesheet?

http://www.musecards.com/store/index.php?main_page=index

Thanks,
AW

Try this:

.centerBoxHeading {
font-weight: normal;
}

Thanks, where in the main CSS stylesheet should i place the code?

i tried it in a few places but it didn't change the appearance, so I know I'm doing something wrong.

Thanks...

i tried it in a few places but it didn't change the appearance, so I know I'm doing something wrong.
Clear your browser cache & refresh several times as I see this working