when I click on the right and left arrows of the media bar it does not scroll through the bar for me.

I have a site where it shows the working code and my site where it is not working if that helps

my site is:

http://salafiwales.co.uk

and the working site is

http://www.elegantthemes.com/preview/Chameleon/

I'd really appreciate it if someone could tell me how to fix it
Many thanks