ASP.NET Menu Items - Dynamic Items Disapearing

[Microsoft Newsserver]

Hi

I have a menu with other elements below it. The submenu items disapear below
the other elemetns on the screen. I have messed about with z-index, but dont
seem to be able to correct the problem. In addition, I have noticed that
when adding submenu items, an IFRAME appears,

Any ideas on how to resolve this would be welcome.

Thanks