Jason - thanks for the direction on combining the two query strings . . . I'm man enough to admit that I didn't realize that could be done. I'll give that a whirl . . . thanks!
Here's a copy of the index page in question. When I submit the product search (plugin on the index.php page) it just goes back to the index.php default screen.
Just in case you want it; I also included the search page (which is a plugin on the index.php page too)
Thank you sir!