I'm trying to submit a form within the Webbrowser control but I can't find the 'name' or 'id' of the submit button. I can insert the Stock Code into the 'securityCode' filed but can't sumbit the form

Below is the form and what I've tried without any luck.

HTML Code:
WB1.Document.getElementById("DetailedQuoteForm").submit
and 
WB1.Document.getElementById("DetailedQuoteForm").Click
HTML Code:
<form name="DetailedQuoteForm" method="post" action="/do/secure/detailedQuote">
  <input type="hidden" name="submit" value="true" />
    <table class="selector-outer" summary="ASX Codes">
        <tr>
            <td>

                <table class="selector-inner" summary="ASX Codes">
                    <tr>
                        <td>
                            <label for="inputasxcode">ASX Codes:</label>
                        </td>
                        <td>
                            <input type="text" name="securityCode" maxlength="6" size="10" value="" id="inputasxcode" />
                        </td>

                        <td>
                            <span class="codesearch">(<a href="companyInfoSearch?url=detailedQuote_submit=true">Search for ASX Code</a>)</span>
                        </td>
                        <td>
                            <input type="submit" value="Refresh" class="button" alt="Refresh" />
                        </td>
                    </tr>

                </table>
            </td>
        </tr>
    </table>
</form>