How do I expire content immediatley?

Here's the problem:

I have an index.html page which features a box with current interest rates. I provide a form for the client to upload new rates, and the form uses a php script to write the new page, titled rates.html

The index page uses SSI to retrieve rates.html and display it to the user.

The problem is that these rates change daily and we don't want them seeing their cached version. Okay, wait, it's not that easy!

We don't want the users having to reload the entire home page each visit, we want only the rates box to be refreshed. The page is a frameset. It's also important that search engines be able to index the page, it is the home page afterall.

We've tried different methods to accomplish this, but all either failed to expire the content or resulted in the Explorer warning about the content expiration.

Help! This seems so simple but I can't find an elegant solution. Is there a way to make this work, or should I tell the client we just need to make it at least one click away from the home page so I can pass variables?

Thanks in advance.

hi,

the same concept is need for me also,so if u found any answere pls. let me know