[jQuery] thickbox + prototype = (Error: e[prop[p]] is not a function)

[jQuery] thickbox + prototype = (Error: e[prop[p]] is not a function)

Hi All,
Im trying to use jquery, prototype and jquery.thickbox.js on the same
page. In jquery.thickbox.js ive changed all reference to $ to jQuery
and all work well except when closing the thickbox window. I get a
javascript error (refer below) and the screen stays greyed out
javascript console error:
##########
Error: e[prop[p]] is not a function
Source File: http://localhost/simpleinvoices/include/jquery.js
Line: 1582
##########
for a live example refer:
http://simpleinvoices.org/svn/index.php?module=invoices&view=manage
-- and click the " What's all these different columns?" link at the
bottom of the page
Has anyone seen this type of error before? If so is there a way to fix this?
note: im using the latest jquery and thickbox and tested in firefox
Thanks, any help would be greatly appreciated
Cheers
Justin
email: justin@kelly.org.au
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