Why is this javascript code failing? (only in IE)

I have a page where I'm loading a lot of stuff, jqmodal, shadowbox, newest jquery etc. All this is ok and seems to work fine with eachother.

But I'm also using jsAnim for an animation, and this gives me a javascript error (object doesn't support this property or method) in IE (all up to 8). I can get around this by removing the shadowbox js file, but I need it. Anyone got an i开发者_开发技巧dea how I can tweak it to work?

I've made a JS fiddle for it here.