menu go under iframe in ie5

[angus]

argh...I am hoping someone will have a solution to this problem, though I am
thinking there is nothing to be done. Can't hurt trying.

We have come up with a dHTML menu system

Problem: we have an IFRAME on our page, and when the menu pops down, it
goes BEHIND the IFRAME. I have tried setting the z-index of both the menu
DIV and the IFRAME, but it does not seem to work in IE5. It always goes
behind.

NOTE: this is not a problem in IE 5.5. Microsoft seems to have fixed this
bug. However, we have to support IE 5 for our intranet.

Is there anyway to place the IFRAME behind the menu when it pops up??? Any
help would be appreciated.

Thanks so much!!!!!!!!!!!

Angus