my site is getting the error in this title in the javascript console. Google seems to say that it is because jquery isn\'t loaded, but it is definitely visible in the head
Apparently you are using both jQuery and Mootools and both of them do use $ as an alias to a core function. Probably the $ function which is generating this error is the Mootools function. I'd suggest you to try to write your jQuery code using jQuery instead of $ so you can confirm my point is right or not.
Good luck!