Script not working in IE9 or Firefox, how to fix it?

Script not working in IE9 or Firefox, how to fix it?

My JQuery script is not working in Firefox or IE9.
I am using IE9 Version: 9.0.8112.16421 and Firefox version: 17.0.1 . The website works fine in Google Chrome and Opera.
The website is located temporarily on my dropbox:  https://dl.dropbox.com/u/53597778/Web%20Dev%20Live%20Tests/Site/tutorials.html

The page in question that is not working is the "Tutorials" page, if you use Chrome or Opera everything works fine. The buttons have the correct ids set and the page content changes as I set it to.
This is not the case with Firefox and IE9, it is either that something I am trying to do is not supported by the browsers or is bad code, or the browsers are just not working with my script.
If anyone could shed some light on this I would be grateful :)