[jQuery] [jquery.form.js v2.18] file upload field and standard fields

[phicarre]

jquery.form.js v2.18

I have a form with a lot of fields and one upload file field:

<form action='' id='form1' enctype='multipart/form-data' style='font-
size:85%'>
    <input type="hidden" name="MAX_FILE_SIZE" value="100000" />

    <table >
        <tr><td>Nom: </td><td><input type='text' size='30' id='nom'
name='nom' /></td></tr>
        <tr><td>Prénom: </td><td><input type="text" size="30"
id="prenom" name="prenom" /></td></tr>
        <tr><td>Photo: </td><td><input type="file" size="40"
id="photo" name="photo" /></td></tr>
    </table>
</form>
</div>

$('#form1').ajaxSubmit(
    {
        type: 'POST',
        url: 'create.php',
        beforeSubmit: showRequest ,
        success: function(msg) {},
        error: function(requete,iderror) {alert(iderror);}
    }
    );

In create.php, the $_FILES is correct  (name,size,type,tmp name,error)
BUT the $POST is empty !
Why ?