Known issue that IE can claim 'Window' like that. Don't know the solution, but I've seen this asked a few times on this list.
- [Moo] Unable to load MooTools (1.3+) in IE6/7/8 AFTER runn... dougwig
- Re: [Moo] Unable to load MooTools (1.3+) in IE6/7/8 A... Philip Thompson
- Re: [Moo] Unable to load MooTools (1.3+) in IE6/7/8 A... Olmo Maldonado
- Re: [Moo] Unable to load MooTools (1.3+) in IE6/7... Sean McArthur
- [Moo] Re: Unable to load MooTools (1.3+) in IE6/7... dougwig
