JQuery sortable lists and fixed/locked items

Question

Is it possible to lock list items in JQuery sortable list in a way that those items will stay in that particular place in the list.

For example,

consider th

Answer 1

Check this out: Forcing an item to remain in place in a jQuery UI Sortable list

Also, I've implemented the above solution with multiple fixed elements here: http://jsfiddle.net/enBnH/12/ (obsolete, see below) It's rather self-explanatory, i think.

EDIT:

I've automated the process for generating the lockto values as well as adding ID's to those lis with the class "fixed" (note that i have to add an ID so we can reference it)

See the COMPLETE solution HERE: http://jsfiddle.net/enBnH/44/

EDIT

Okay, after a gazillion errors with the above, i just rewrote the dang thing myself: http://jsfiddle.net/thomas4g/GPMZZ/15/

NOTE: The above does work, but @DarthJDG's answer seems a lot nicer to me. I'm leaving mine up on the offchance someone might prefer how mine behaves (i've learned not to delete stuff just beceause there's a better version :P )