Script works fine in JSfiddle but not on site

[ultraloveninja]

I'm working on the ability to show/hide div's when an image is clicked and to randomly show divs on page load.  I'm not quite sure why it works in the testing area (JSfiddle) but not when I implement it into the site.

 

Here a link to the fiddle:  http://jsfiddle.net/JmVUx/17/

 

 

And here's a demo to the site I am working on:  http://sjdunham.com/test/yzn/

 

Am I missing something?  Not too sure what could be the difference between the two.  I've tried stripping out any other references to other scripts and still no go.  Any help is greatly appreciated.  Thanks!