[Zope] caching time-outs?

I understand how the RAM Cache Manager works, I think, but what I need is something slightly different, in a couple of ways: * I'd like a cache manager that I can install in the root folder, and have it apply to the whole site (or in any folder, applying to all folder contents, including sub-folders, etc.) * I'd like to be able to cache things but have the cached elements "time out" after N minutes. Clearly, I'm not worrying about correctness, but simply efficiency. Basically, I don't care if it takes N minutes before a user sees a given change to the site (it's fairly static). Any chance? (Please reply directly, as I'm not on the list right now.) Thanks. -- Cheers! Chris Ryland Em Software, Inc. www.emsoftware.com