produc list, friendly url, backgroung image,...

Hello,
I'm new using zencart. I'm just configuring and customizing my first zencart site. some questinos:
It is possible to show the product list of a category in rows and columns?, like shown in "new products".

I've seen in some webs added in the "showcase" that they always show the main url in the browser window (http://www.mysite.com/) no matter the section of the web you're looking. My browser shows: "http://www.mysite.com/index.php?main_page=product_info&products_id=202&zenid=366c9d37c90f1c27e7884e6493353cb6" when navigating. How can I correct this. Its a zen feature?

It is possible to shown a background image for a zencart page? And if so.... its possible to change the image for every session?

How do I disable the login in my site? I want to set up the clients myself.

thanks for your answers,

Look in the downloads/other section of this site(in the top nav bar) for the column-grid module.

Look at the read_me file in your /css folder and seek the css per page for changing images per page