I'm not sure how the header image is setup for this theme but adjusting the image values to 100% will make them shrink/stretch to any screen resolution. Of course you better make sure you're using as high resolution images as possible for your header image or it will only get more pixilated the more it stretches. You may also want to consider making the header image a background image only.

I'd also suggest if your users screen resolution varies widely, you may want to consider making your site logo in as high a resolution .gif (with transparent background) as possible and locking it's values at one size. This way your site logo will always be the same size and will never lose clarity regardless of client screen resolution.

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My Daughter Rules!