jquery ajax file upload

function showSpinner()
{
    $('#resultsArea').html('<img src="img/new_spinner.gif">');
}

function isIE()
{
    var undef,
        v = 3,
        div = document.createElement('div'),
        all = div.getElementsByTagName('i');

    while (
        div.innerHTML = '<!--[if gt IE ' + (++v) + ']><i></i><![endif]-->',
        all[0]
    );

    return v > 4 ? v : undef;
}

function handleUpload()
{
    showSpinner();

    var dFile = new FormData(document.getElementById("devConsValidate")); // this works in IE but only if called by a submit method

    $.ajax(
    {
        cache: false,
        async: false,
        url: 'validator.php',
        type: 'POST',
        data: dFile,
        dataType: 'JSON',

        processData: false, // this is key for formdata
        contentType: false, // so is this

        success: function(response)
        {
            var result = response.result;
            var validationCode = response.validation_code;
            var errors = response.errors;

            var htmlCode = '<h2>';

            if (result == 'SUCCESS')
                htmlCode += '<font color="green">';
            else
            {
                htmlCode += '<font color="red">';
            }

            htmlCode += 'Validation ' + result + '</font></h3>';

            if (result == "FAIL")
            {
                htmlCode += '</center>';
                for (var i in errors)
                    htmlCode += errors[i] + '<br>';

                htmlCode += '<br><a href="validator_help.php">Validator Help</a>';
            }
            else
            {
                htmlCode += 'Please use the following code when submitting your request.<br><br><font color ="#00aa54" size="+2">' + validationCode + '</font>';
            }

            // make some beautiful html
            $('#resultsArea').html(htmlCode);
        },

        error: function (XMLHttpRequest, textStatus, errorThrown)
        {
            alert('error: ' + errorThrown);
        }
    });

}

$(document).ready(function()
{
    if (isIE() != undefined)
    {
        $('#devConsValidate').submit(function()
        {
            handleUpload();
            return false; // dont really submit because we already did
        });
    }
    else
    {
        $('#fileBox').change(function() // this doesnt fire in IE
        {
            handleUpload();
        });
    }
});