You can place whatever image or text you'd like here by using the following:
You can quickly edit this content via Admin->Tools->Define Pages Editor, and select define_main_page from the pulldown.
NOTE: Always backup the files in /languages/english/html_includes/your_template
Remember that you must add the "custom" (or whatever name you choose to call the directory in which you will store altered .php pages) folder to each directory in which you wish to alter something from the default .php page(s).
