Help with rotating banner placement.

[DeeperImage]

I have it in the right spot, but only the flash banners work fine, the regualar picture banners distort my image header. How can I fix this?? Please take a look at the images below so that you can see what I mean. I also use Power Banner which is simply to use.

Right now I have this code in phpinclude_start
ob_start();
require("/***********/banner.php");
$banners = ob_get_contents();
ob_end_clean();

and then I simply added $banners into any template and it works. If I just add the $banners in there it messes everything up and does not align on non flash banners. What html/code do I insert so that it maintains the 468x60 and shows the banners? and it does not messes up my header? thanks.