form submit and clear

[Craig Hopson]

hi guys using thishttp://www.simonerodriguez.com/ajax-form-submit-example/ here is my form

<form name="MyForm" action="feedxx.php" method="post" onsubmit="xmlhttpPost('feedxx.php', 'MyForm', 'MyResult', 'Wait'); return false;">  <input name="sample_text" type="text" size="30px" placeholder="Type a Message" />  <input name="send_button" type="submit" value="Send" /></form>

after i submit i need to clear the form i tried this

<form name="MyForm" action="feedxx.php" method="post" onsubmit="xmlhttpPost('feedxx.php', 'MyForm', 'MyResult', 'Wait');this.form.reset(); return false;">

but didnt work? how do i do it????