Thanks Ajeh - but I've already tried that.
The problem is that my Main Page has a different layout than the inside pages. So when I change the category to open up with, it alters my index page layout to look just like the inside pages, and I can't have that.
Maybe I should have given more information (I hate it when I see ambiguous questions, and here I am serving one up - beat me with a wet noodle!)
The way the site is designed is that the index page has a header naviagtion at the top - very basic. Contains links to the home page, and a couple of E-Z Pages, as well as Log In, Shopping Cart and Checkout. This header nav is constant throughout the site.
On the idex page, we have two sections: the right side has a large image (it's a photographer's site) and the left side has some introductory text on what the site is about. Under this text are small image links that will draw you into the shopping area - each link represents a different category for products, so each link will lead you to a different section of products (as it should be).
My issue is, when someone clicks on the main category link on the index page (the only way to get into the products listing areas), it takes you to the page that shows you the category, and then lists the subcategories. So it takes an additional step to get right in there and look around - something the client does not want. They want someone to either 1) click on the main category link on the index page and be taken to the main category page which houses all images contained in that category (my initial question) - and narrow things down if they so choose by clicking on the subcategories; or 2) have the index page link take you directly to the top-level subcategory, if there is one.
For the record, once you get to the inside pages/shopping area, there is alreayd a list of categories and subcategories in a sid nav menu - so the "open up to the main category" is (my client's words) "redundant and annoying".
So making those alterations in the admin isn't doing what I need it to do - it would, except that it's doing it on the wrong page. I haven't been able to find a setting for the categories so that you can have the category itself open to the first subcategory (if there is one) rather than opening up to the main one and have it show the list of subs before you can move on.
Man, I hope that made sense. I'd show you - but I'm working off a localhost server right now - so if more clarification is needed (for anyone who may be able to help), let me know.