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

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