The change event doesn't fire in IE when fields are filled from the browser's autocomplete list.
Test page Workaround is included
Reported by: Jehiah Czebotar.
Explorer 5-6 Windows | Reported on 4 October 2005.
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1 Posted by Jehiah Czebotar on 20 October 2005 | Permalink
How nice. Microsoft even says that it doesn't fire on their documentation for autocomplete
http://msdn.microsoft.com/workshop/author/forms/autocomplete_ovr.asp
they suggest using onpropertychange instead of onchange