jquery fancybox, ie8, Message: 'loading' is null or not an object

My website has an error in IE 8.0.6001.18702, which is something to do with jquery fancybox 1.3.1.

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/
4.0; .NET CLR 2.0.50727; MS-RTC LM 8; .NET CLR 3.0.4506.2152; .NET CLR
3.5.30729)


Message: 'loading' is null or not an object
L开发者_运维技巧ine: 36
Char: 4
Code: 0
URI: ....../jquery.fancybox-1.3.1.js

Any ideas? It happens when i try to activate the iframe fancybox. I'm clicking a link in the form of:

<a href="" class="iframe fancybox">blah</a>

I have a link, but you'd have to sign up to the site to see the error. let me know if you want it

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The answer was to upgrade to the latest version of jquery, 1.4.4 and this sorted out the issue.