Images for Categories, Subcategories and Sub-Subcategories.

[shannonphx]

I have a large site with many categories, subcategories and sub-subcategories. My top level categories display a large image at the top of the page, which represents the category. I just started adding smaller images to my site which represent each of the subcategories, but if a subcategory also has its own sub-subcategory, then the image for the subcategory displays huge at the top of the sub-subcategory page. How do I get rid of this image & configure my site to display large category images ONLY on the main top level categories & not on sub-subcategory pages?