You had to have done something else other than that :). I remove the outerax element in the HTML and it still is messed up . The problem is that hte adsense div isn't floated at all, and it's contained outside of #masthead so there's no way it can be on the same line. Float the .rightsense element along with #masthead. Now you need to adjust your widths. It's too wide. Change #outerax to 580px width instead of 800.
You should realize you're coding a site that's way too wide (along with multiple other issues which we've mentioned to you 10 times already) :).
But if you float both the elements I said, along with the width change, it'll line up.