this.options is undefined in Firefox 3.6.8 out of jquery ui widget 1.8.1

this.options is undefined in Firefox 3.6.8 out of jquery ui widget 1.8.1

My colleagues are not getting this error, we have the exact same code/data/etc, different environments.

This error occurs: this.options is undefined
when i select a tab, here is the most relevant js file:
http://john.martirano.net/code/mytabs.js

I had an earlier similar error where this.success is undefined was thrown for lack of a definition of success in the ajaxOptions passed into tabs.  You can see in this file a declaration with an empty implementation.  I'm not sure where options would be expected to be defined in this case.

Any ideas anyone?

again, i am on Firefox 3.6.8 and it appears to error out of jquery ui widget 1.8.1

John