Permission Denied error message: Custom Messaging instead of

I am able to set permissions on items and pages just fine. However, if a web user that doesn't have permission to view that page, clicks a link to go to the page (item, document or news) then we get a .Net message saying you don't have permission. This makes the user think the site is broken and I don't understand why SF leaves this messaging in the hands of .Net server.

How would I set SF up to display a page or message "You don't have permission to view this content, please login or click here to request access"  

Thanks,

Brian

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