Corrupt browser cache?

I use RVskin for my customers and have developed a custom skin with my companies header and links at the top. However a lot of customers are getting error's loading the pages now (when i say a lot i mean about 15-20%) some times they can clear their browser cache and everything is fine but I was wondering if there is a good way to determine the issue and MAKE IT STOP! Corrupt browser cache?

the header is also located at www.needhosting.net/stats on our stats page if you want some referance..

Thanks "y'all"

 

 

 

 

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