Use of the upload files function

Hi again , well in your PorjectorDialog.js u have this function addDocumentVersion

i'd like to do some upload on my own can use this function

I have an input type file in my class.php and i'd like to do the upload by js

<INPUT type=hidden name=MAX_FILE_SIZE VALUE=2048>
<INPUT type=file name="nom_du_fichier">

<button id="sendInfoToUser" showlabel="true" onclick="javascript:getVal()">Send information</button>

the function getVal() get all the field of the form everything work fine just left the upload of the file

So can you help me how to do upload using your function addDocumentVersion

Thanks in advance