Do you just want to change the text (eg. instead of saying Search Departments you want it to say Search Designers or just Designers)? These are string resources that can be changed in the admin section. The string resources you're looking for are AppConfig.CategoryPromptSingular, AppConfig.SectionPromptSingular, and AppConfig.ManufacturerPromptSingular (or searchadv.aspx.18 depending on your version). If you change those in the admin section and reset the cache the changes will reflect on the front end. If you are ever unsure about which string resource to change, you can follow the instructions in this knowledgebase article to review which string resources are being used as you view the page.
<a href="http://www.aspdotnetstorefront.com">Shopping Cart Software</a>