By looking at your sites header, I'm a bit confused over what your looking for, I'm not sure if this is what killerbee may have been referring to.

It appears the flash header with the site logo and counterstrike text is 619 w x 300 h and the other flash image off to the right is 285 w x 300 h. Are you looking to replace both images with one large static (or animated) header or simply replace the flash with the sites logo?

Thanks.