With Firefox and the addon Firebug; and with a little practice, you should be able to identify the areas in the stylesheet that need to be adjusted.
Edit your stylesheet.css
I would suggest removing all references to #navMain and then adding the CSS;
Code:
#navMain ul {background:#444 url(../images/bg-menu.png); color:#fff;border-bottom:1px solid #808080;border-top:1px solid #808080;list-style-type:none;margin:0;padding:0;width:100%;}
#navMain li {float:left;width:auto;}
#navMain a {color:#fff;display:block;padding:10px 5px;}
#navMain a:hover {background:#444 url(../images/bg-menu-hover.png) bottom; color:#fff;}
then adjust to suit...
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