Multiple <li> styles in one <ul>?

[susanjohnyba]

Hello,

I have been stumped working on this issue for about 2 days now, but havent been able to jump this hurdle:

transeca.com

My navigation is dynamically created in a loop:

<ul id="glossymenu">
<li>Category</li>
<li>sub category</li>
<li>sub category</li>
<li>Category</li>
<li>sub category</li>
</ul>

If you visit the page, the first <li> is 'Pet GPS' , this is a top level category. The next top level category is all the way at the bottom called 'Test'.

Basically Im trying to assign 2 different styles a 'Category' and 'sub category', my attempt at this is using an id on only the top level <li>'s:

<ul id="glossymenu">
<li id="maincat">Category</li>
<li>sub category</li>
<li>sub category</li>
<li id="maincat">Category</li>
<li>sub category</li>
</ul>

But I dont seem to be able to override the style in this manor:

#maincat li a{
background:#000000;
}

My stylesheet:
transeca.com/css/style.css

Any advice is deeply appreciated!