SCRIPT5: Access is denied in IE9 for iframe on the same domain
I don't know anything about jQuery, but it is a common javascript error. IE doesn't allow forms with files attached to be submitted from a script.If you however place the form in a seperate file and load it into an iframe, frame.form.submit() will work.
I suggest you to use the lastest of JQuery(> jquery-1.8.0). Since the version 1.8.0, they solved somes IE9's bugs whose this error.
I had the same issue. I was using the same versions as in the example. The example worked but I didn't manage to make it work in my app.
I'm using Backbone and I think it is related to creating the form dynamically, but unfortunately I didn't have time to debug the exact problem.
I moved to https://github.com/blueimp/jQuery-File-Upload, and now it works.