The following tutorial will show you how to manage the sidebar images (called callouts) in Magento. It’s an easy task, but finding them requires a small bit of digging (as usual).
To make locating callouts easy we recommend you to enable the debug tools.
After enabling the Template Path Hints and Block Names you can see that the template files (phtml files) which include the html for the callouts are located at:
Open app/design/frontend/*/*/layout/catalog.xml, locate <reference name="right"> for the right column or <reference name="left"> for the left column. Replace