putting divider between products in same category and listing horizontal

I need to put a divider in between products of a same category...

notice on this page, how there is a text and grey box divider between certain products of the same category, so:

HYDRO PROOF OLIVE TONE - in grey box - then below 5 products

the, HYDRO PROOF RUBY TONE- in grey box - then below 5 products

but all of these products are in the same category

this is an example of what I need to do..

http://kettcosmetics.com/index.php?cPath=131

So how would I create these dividers.... also how would I: lay them out horizontally?

thanks!

notice how all these products

That's an OSC shop, not a Zen Cart, so how they did it is both unknown and irrelevant. But for your ZC, first install the Column Grid mod from Downloads.
Then look at this thread from earlier today: Separate Product Listing by Category, especially post 9.

I know they are using OSC, but I need to know how to do it in ZC because I need the same thing... Thanks for your inputI will install the mod and look at ur thread...