Changing tabcontainer colors with CSS

Currently I'm making my first site with dojo and I'm having a problem
getting the default colors on the tabs of the tabcontainer to change.

The site is http://www.greenflynetworks.com/index.html

I have put the following entries into my css
(http://www.greenflynetworks.com/greenfly.css)

But I cannot get it to take.

The right images are there but seems like the default's are overriding
my specifics. Can anyone point me in the right direction?

http://www.greenflynetworks.com/images/tab_top_left_greenfly.gif
http://www.greenflynetworks.com/images/tab_top_right_greenfly.gif

Help.

-Cody
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