iframe submit click not working in ie

<asp:Content ID="GetSamples_MainContent" ContentPlaceHolderID="MainContent" runat="server">
    <div class="grid-12">
        <div class="grid-8" id="ssi_frame">
            <div class="margin-left-30px">
                <!--Modified By Q03619 -->
                <iframe width="900" name="ifr_GetSam" height="1350" frameborder="0" src="https://secure.startsampling.com/sm/dependus102702?type=all" ></iframe>
            </div>
        </div>
    </div>
    <div class="clear-both"></div>
    <img src="https://bh.contextweb.com/bh/set.aspx?action=add&advid=1363&token=KIMB1" width="1" height="1" border="0" />
</asp:Content>

<div id="wrapper">
<form id="registrationform" target="ifr_GetSam" style="display:inline" method="post" action="addAddress.iphtml">
<input id="formSubmit" width="132" type="image" border="0" height="30" alt="Submit" src="public/images/btn_submit.jpg">
</form>
</div>