Odd showing/hiding layers in Netscape

Hi,

please can you help me out with this.
I made a website for a friend of mine.

[color=#8000ff]www.kempf.cc[/color]

When you choose the html-version, you will find a pretty simple javascript-controlled menu showing and hiding depending on the mouse position.
The content of the site is shown in an i-frame below the menu.
No problem for Internet Explorer.

BUT when I open the site in Netscape the menu always disappears when I put the mouse on the last two lines of the menu.
I guess this has something to do with the fact that the menu-layer overlaps the i-frame at the last two lines.

Please, any ideas (except changing the position of the menu or the i-frame) or source-code-tips?

Thanks in advance!! regards

Firegambler

Forget about it,
I’ll change it in another way,

thanks anyway!