ajax method type post

ajax method type post

hi friends i want to this form to be witdh fonctins jquery ajax

help me pleasse

<form method="post" action="popup_0.xhtml">
<input type="hidden" name="t" value="new">
Name:<br><input type="text" name="usr_name">
<br> <a id="text">kkkkkkk</a>Body:<br><textarea name="popup_txt" rows="5"></textarea>
<br><input type="submit" name="submit" value="Send message"></form>