Additionally, IE throws up this error:
Webpage error details
User Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.2)
Timestamp: Mon, 16 May 2011 12:16:28 UTC
Message: Object doesn't support this property or method
Line: 1
Char: 28289
Code: 0
URI: http://moodle2.southdevon.ac.uk/lib/editor/tinymce/tiny_mce/3.3.9.2/tiny_mce.js
...which the other browsers mentioned previously do not.