[jQuery] jQuery, $ is Not Defined Errors

[jQuery] jQuery, $ is Not Defined Errors


Hi all,
I'm having an issue on a site I'm building where the datepicker is not
loading. Firefox throws two errors, one on "jQuery is not defined" and
the second on "$ is not defined."
Demonstration page is up at http://ficclaims.com/perf/new/
I've googled the errors, and I found a few others having the same
errors, but either dead ends or no resolution was ever posted. It
seems like it must be something simple, but I can't root out the
problem.
Currently, I'm using a custom configured download of the jQuery
datepicker UI widget, with nothing else, no core, or other widgets (as
I was told that nothing else was required). I have also tried
unsuccessfully to use the full jQuery dev package and also with just
jQuery core and datepicker together by themselves.
I'm struggling to find any solutions.
Any help is appreciated,
Wayne