[Halfhidden]

Ok... sorry been out to get some supplies in. Yes I can see what you mean with Permatakus
The reason why IE displays the drop down and not FF is simply the difference between the two browsers and how they handle javascript errors.
In your case, either way the script is wrong.
You have an error in the javascript and the script is expecting an ")" but it is missing and this changes the code.
You'll have to go through the code and compare yours with that of the original code posted on this thread.
To have a look yourself open your page in IE and have a look at the very bottom left hand side of the browser window of IE and you'll see a yellow triangle. This suggests that you have a code error on your page. Click on that and you'll see the suggested code error.
Don't take the code error as gospel because often a missing piece of code elsewhere can have an affect somewhere else. IE will only report some errors.... So have a good look over your code again I'm afraid.
Hope this helps?