ImageButton does not fire

Hi.


I have the following image button:
<asp:ImageButton ID="submit" EnableViewState="true"   
                                ImageUrl="/images/btn_submit.png" AlternateText="Submit" CssClass="f-right"
                                runat="server" onclick="submit_Click"></asp:ImageButton>


The event is fired in Firefox but not in IE*. anyone any ideas?


Thanks


Jason.

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