Preventing iframe caching in browser

Question

How do you prevent Firefox and Safari from caching iframe content?

I have a simple webpage with an iframe to a page on a different site. Both the outer page and the

Answer 1

Have you installed Fiddler2?

It will let you see exactly what is being requested, what is being sent back, etc. It doesn't sound plausible that the browser would really hit its cache for different URLs.