I'm working on a new template and there is content that I want to remain constant on the main page in the center column.

How would I go about adjusting the tpl_main_page so that it works basically as the index_default does. What I'm referring to is when the categories and other links are clicked I want that content to continue to appear below the location of the main_page content vs. having it disappear and the modules move up.

I've been looking at both files, but I can't quite get my brain around modifying the main_page to accomplish this.

I hope I haven't confused anyone.

Any ideas?