Unwanted black horizontal black strip using firefox

My pages are are looking as I want in IE, but fire fox is adding a black strip about 4 or 5 px wide between the top nav area and the logo/header area. I have been unable to find anything for this top area except for the background color and tile_back.gif. Both of which I have changed.
check it out in firefox and Ie, you will see what I mean . .
http://www.johnsonmagicproducts.com/shop

Found it,
Changed the padding under:
#navMainWrapper, #navSuppWrapper, etc . . .

And it just ... magically disappeared? :Flush:

(I want some of those tricks. The ball and tube especially.)

Rob