[jQuery] [FORM] Plugin -Error after Upgrading to jQuery1.3

[Up-Works]

After upgrading to jQuery 1.3 the FORM plugin has an issue with FILE
uploads.  When attempting to submit a form containing a file input
type using .ajaxForm()  it throws an alert stating: Error: Form
elements must not be named "submit".

Here is the form:

<form id="imgUpdate" action="#" method="post" enctype="multipart/form-
data">
          <input type="file" name="mainImage" id="mainImage" />
          <input type="button" name="imgCancel" id="imgCancel"
value="cancel" />
          <input type="submit" name="imgUpdated" id="imgUpdated"
value="update" />
        </form>

And the jQuery:

var optionsI = {
        target:        '#imgStatus',
        beforeSubmit: imgSwap,
        success:       showResponse3,
        url:       'save.php',
         type:      'post'
 };

$('#imgUpdate').ajaxForm(optionsI);