What Adobe product are you using? You posted in a forum dedicated for supporting Adobe RoboHelp and I'm doubtful that you are using RoboHelp.
Assuming you posted a legitimate question, you need to re-post this in the forum where the product you are using is discussed.
Doesn't look like RoboHelp to me
Anyway, replace the central <center> by <div id="centerplaceholder"> and add the following css:
margin: 0 auto;
(Don't forget the </center> tag.) You may also want to consider to turn the grey image into a css background image to improve page performance.
I had a really hard time finding a forum that was in line with what I needed. I was under the impression that I was in a Dreamweaver Layout Issues area, but now that I'm looking at the hierarchy, I can see that I am NOT in a Dreamweaver Layout Issue forum..Oopsies!
Thanks for the help, I will try that code and see what happens