Jquery :: Failed To File Upload

i am trying to upload a file with jquery but i am failed here is my code

HTML Code:
<script src="js/jquery.js" language="javascript"></script>
<script src="js/jquery.form.js" language="javascript"></script>
<script language="javascript">
function getResult(){
var encoded=document.getElementById('file').value;
[Code]...

when i echo the $queryz with $_REQUEST method variable the variable shown the img name but the $query= $_FILES[$query]["name"]; this thing shown nothing and not upload the file in images folder