Problem with Internet Explorer and Saving Pages

I can edit products without a problem. However, when it comes to editing pages, I have no problem at work where we use Firefox but, from home where I use IE 8, I get the following error messages every time I try to save a page:

Message: ‘form’ is null or not an object

Line: 261

Char: 5

Code: 0

URI: [url][/url]

I get this message every time and my edits don’t take hold. It was doing it with IE 7 and again with IE 8. Can anyone shed some light on this?