The screen shot for Firebug gives good information of one part of the problem. It would be great having one more: the Script console and, most valueable of all, the URL for that page.
It is very likely to be conflicting jQuery versions. That theory is reinforced by the presence of scripts for GA and Omniture among others . Please review the page source. You may find references to jQuery 1.9.1.
If two versions of jQuery are loaded, calling $.noConflict( ) from the second version (Marketo Munchkin, jQ 1.8.2) will return the globally scoped jQuery variables to those of the first version.