[jQuery] Cascade (chained) works in Firefox but not in IE

[jQuery] Cascade (chained) works in Firefox but not in IE


I am new to JQuery and your cascading dropdown was exactly what I was
looking for. After formatting my data in JSON I have tested out the
Chained example (http://dev.chayachronicles.com/jquery/cascade/
index.html) and it ONLY WORKS in Firefox and NOT IE.
I am attempting to load the data from two external files, while your
example loads the second data set from a static var.
Is there a further step necessary to get this to work in IE?
I have my working example at: http://jamestilberg.com/jquery/
Any help would be appreciated! :)