Joined: 13 Jun 06
22 Oct 07 9:02 pm
I don't think it'll make any difference, really. The only thing that I can think of is that the menu might not be visible to the search engines. If you can go view > source and look at the source code, that's pretty much what the search engines see (except for things that it's been told to ignore, like things that are commented out). If you can't see your sub-menu there, then the search engine spiders probably won't be able to see it either.
But so long as you have other links to the pages on your site, and/or a site map, it should be fine.
If you're really concerned about the URL (which I don't think you should be) then you can try replacing "menu_four" with something that has your keywords in it.
All the best,