wp_nav_menu CSS Confusion

Hey There!

I’ve been trying to wrap my head around how to style the CSS in the generated wp_nav_menu. I know there’s the codex on here, but it’s not really explaining what I’m looking for.

I’m trying to figure out how to split the sub-menu from the main-menu. However, the sub-menu always generates within a ul li ul li – which makes sectioning it off and using it (for my purposes) effectively. In my situation, I’m trying to create a 2 level horizontal menu. But, wheenver I stayle the darned thing, it just goes really, really wonky.

Also, how does this thing build it’s CSS anyways? I’m using the 960 and I would love to be able to throw the menu in a grid_24, have each li populate in a grid_3 – however I can’t really figure out where/how this can be done.

Any ideas? Thoughs?

Thanks!
JC