Submitting a form that only contains submit input resulting an error

[Servant]

How to click the tag <input type="submit" name="submit" id="submit" value="Publish this ad"> on this kind of form?

<form name="publish_form" id="publish_form" method="post" action="http://www.example.com/jobs/publish/xxxxx/">
    <fieldset>
        <div class="right">
            <div class="suggestion">If you changed your mind, you may <a href="http://www.example.com/jobs/deactivate/xxxxx/" title="cancel posting this ad">cancel posting this ad</a></div>
        </div>
        <input type="submit" name="submit" id="submit" value="Publish this ad">
        &nbsp;or&nbsp;
        <a href="http://www.example.com/jobs/post/xxxxx/" title="Edit it">Edit it</a>
    </fieldset>
</form>

I already tried this code:

#include <IE.au3>

Local $oForm = _IEFormGetObjByName($oIE, "publish_form")
Sleep(2000)
_IEFormSubmit($oForm)

But it caused a problem: --> IE.au3 T3.0-1 Error from function _IEFormSubmit, $_IEStatus_COMError (-2147352573)

Is there any other way to submit that kind of form?

Edited January 18, 2014 by Servant

[michaelslamet]

Check >this and >this