My magento store is version 1.9.1 I'm using a modified version of the rwd default theme. By default, in the main top navigation bar your category names appear as text which links to their corresponding pages. I want to change one of my category names from this text to a small image/ .png because I want one of my categories to be a brand and I'd like to show off that logo there. I don't want to change all the category names, just that specific one. What can I do?