Take a look at www.edutrade.co.uk
On the main page, I have a large number of images advertising certain products. I created these in Photoshop and gave them different names, then uploaded them to a sub-directory called "mainpage" in the "images" folder.
Look at the image on the right of my home page called CLASSIC TOYS.
The PATH to this image is:-
HTML Code:
http://www.edutrade.co.uk/images/mainpage/watches.jpg
The URL to the part of my zenshop selling classic toys is:-
HTML Code:
http://www.edutrade.co.uk/index.php?main_page=index&cPath=138
So the HYPERLINK attached to this image, enabling a click to take you to that category is:-
HTML Code:
<a href="http://www.edutrade.co.uk/index.php?main_page=index&cPath=138"> <img src="http://www.edutrade.co.uk/images/mainpage/classictoys.jpg" border="0" width="180" height="242" /></a>
As I said, this is basic HTML - nothing special for Zencart - so if you don't know how to use HTML then it may be worth your while to do a couple of online tutorials. There are some good free ones at W3schools.