problems with Javascript Menu and Firefox

[DavidFrance83]

I'm facing a problem using a JS menu and Firefox.
I put this menu in the header of CPG143 ; it works with Internet Explorer, but doesn't with Firefox. Anyone could help ?
http://nakata.online.free.fr/cpg143

PS: you may see that the links from the menu don't work, linking with a "construction.htm" page : it's normal don't worry...

[Stramm]

try an actual version of that menu script
http://dynamicdrive.com/dynamicindex1/hvmenu/index.htm

edit: and update to the most recent version 1.4.4 (highly recommended)