iframe and quthorize.net

I am using an iframe to display the form test.authorize.ent/payment/payment. when i press the contunite button on the authorize.net page it should close the iframe and take you to the final check out page. it opens in the iframe. Does anyone have an idea how to do this. I am also posting this to the authorize.net forum.

Below s the code i am using to call the iframe

 <div id="myForm" style="display:none">
    <div id="inline_content">
        <script src="Scripts/colorbox/jquery.colorbox.js"></script>
           <script type="text/javascript">
        $(".inline").colorbox({
            inline: true,
            opacity: 0.5, // overlay a bit less dark
            innerWidth: 640,
            innerHeight: 390,
            onComplete: function () { document.OutputForm.submit() }
        });

       
    </script>
         
        <form name="OutputForm" method="post" action="https://test.authorize.net/payment/payment" target="payframe" id="LinkTo" class="ShowForm">
      <input type="hidden" id="InToken" name="Token" value="" />
       </form>
        <iframe id="payframe" name="payframe"></iframe>
        </div>
        </div>