Intercepting "Save As" / "Save" in IE

[craigslist.jg]

Hi,

I've built a client side webpage for our internal users, which when
loaded, generates some HTML within an iFrame. The HTML generated to
the iFrame is then saved as HTML. I know it's useless to disable the
Save As command, but can I at least intercept when they select this
from the menu and display a message?

Thanks