As Kuroi has states, this is the style, not the content.

Your style can be found in: http://www.yourwebsite.com/includes/...stylesheet.css

I have turned mine off a long time ago, but I believe your are looking for an ID or a CLASS named navCat.

If you post exactly what is is you're trying to change and where (i.e. what the website is) we'll be much more able to help.

Also, get FireBug and the Web Developer addons - theyr'e lifesavers. Right-clicking anything can turn into clicking the Inspect Element menu item and there you see exactly why your element is being styled the way it is.

-Tim