Javascript onchange different in IE and FireFox

Question

When this onchange event in IE returns false, IE focus stays on that input box. In Firefox the focus always moves to the next field regardless.

HTML:

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Answer 1

Have you tried adding a "return" in the onchange attribute? i.e.

I'm not entirely sure that this would work, but worth a try?

Edit: to clarify, the reason I'm not sure is that I'd usually approach this differently and bind the event handler in javascript rather than html.