Error "r has no properties"

First of all, I would like to say that this is a great idea - it should go into core IMHO!! (with a bit more work :)) ). I have a few problems and suggestions, here is the first.
I'm using Drupal 5.1, JQuery Interface Library 5.x-1.0, JQuery Update 5.x-1.0, and Quick Admin Menu 5.x-1.0-beta. I've copied the jquery.js from the Jquery update module directory to misc/jquery, I'm running PHP5. I'm running on Windows/XP (my local workstation to test things out, behind a firewall, so if Jquery update needs to access an external site that won't work) and using Firefox 2.0.0.6

However, when I edit a menu item and then press "Submit" in the edit box, I get a js error in the Firebug console that looks like this:

r has no properties
e("Test")jquery.js (line 2)
submit_edit_dialog([a drupal-5.1])qam.js (line 331)
(no name)()qam.js (line 425)
e(click clientX=0, clientY=0)jquery.js (line 2)
[Break on this error] eval(function(p,a,c,k,e,d){e=function(c){return(c<a?"":e(parseInt(c/a)))+((c=c%a...

Any ideas?