Misleading error message when JQueryUI loaded twice on page

[nlothian]

Summary: JQueryUI should detect if has previously been loaded on a page

What steps will reproduce the problem?

1. Page includes script tag loading JQueryUI
   

2. Page also loads JQueryUI using google.load function
   

3. A call to .show() on an element gives a "too much recursion" error deep

inside JQueryUI

4. Developer doesn't realize there are two copies being loaded, and -

trying to do the right thing - starts to try an isolate a test case for what appeared to be a JQueryUI bug

5. Developer suddenly realizes it is a problem with the library being

loaded twice - and - having spent some hours initially tracking down the problem - decides to raise it on the google AJAX bug tracking systemin the hope that google.load(..) could handle this case better.

6. Developer raises ​http://code.google.com/p/google-ajax-apis/issues/detail?id=204 against the Google AJAX Google.load() function
   

7. Google politely points out that this is a JQueryUI problem, not a Google problem.
   

8. Developer recreates test case using plain script loading, and raises this bug
   

[nlothian]

test case - run in IE to get nasty message box, or Firefox+Firebug to get console error

[Scott González]

This should be fixed for 1.7 from a previous change. As a side note, using jQuery 1.3 with jQuery UI 1.5 won't work.