CSS & CE Reverse Proxy Caching - Freshness and Content - Help !!!

We have a pair of 11054's and a pair of 570 CE and a pair os SCA's and using them in a RPC configuration in front of a series of static content web servers.
My problem is I want the CE's to server content even when the origin server(s) are down but where the content is cached fresh or not. So of if the cache has the content, serve it no matter what its freshness. I don't want to have a sorry server used unless the content isn't cached at all.
Or can I pre-position content on the same CE and have it server from there. What content types can be prepositioned ? Is someone going to tell me I need a content router now of something ?
Anyone have any bright Ideas ??
Thanks
Simon

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center (http://www.cisco.com/tac) or speak with a TAC engineer. You can open a TAC case online at http://www.cisco.com/tac/caseopen
If anyone else in the forum has some advice, please reply to this thread.
Thank you for posting.

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