First problem I notice is that, at 1024x768 (85Hz) on my 21" monitor -- your last Google Ad block in the header doesn't fit and is put below the rest... (it's okay at 1280x1024, but everyone doesn't have that, or widescreen.)
Secondly, adding </center> in the HEAD section won't solve anything.
In your Header include, you placed a <center> tag before your logo, but never closed it. You want to place the </center> after the last Google adblock. Or better yet, put everything in a table and align=center the table.
And if you can narrow that header a bit, it'd be cool. Add width and height parameters to your logo. Place the whole shebang in a table w/o cellpadding/spacing with a white background to lose that line between the logo and the Ads. And try to narrow the ads up.
Your code shows 4 blocks of 250-width ads, but I only see 3 showing up? Lose one. Your logo is 361px wide, you can't have 4 blocks of 250px in the same line... 3 barely works...
Start there and then let's see how it looks...
