i have implemented this script for uploading files with ajax, it works perfect in other browsers except for explorer, i noticed that formData is not supported by IE9 and less, are there any alternatives for formData in IE, and i want use clean javascript

    function doObjUploadExplorer(url, lnk_id, file, progress, success, content, frm, div_dlg, start_func){

    var file_input = null,

      frm_data = new FormData(),

      req;



    try {

        //firefox, chrome, safari etc

        req = new XMLHttpRequest();

    }



    catch (e) {

        // Internet Explorer Browsers

        req = new ActiveXObject(Microsoft.XMLHTTP);

    }





if (document.getElementById(file)) {

    file_input = document.getElementById(file);



    for (var i = 0; i < file_input.files.length; ++i) {

        frm_data.append(file, file_input.files[i]);

    }

}



req.upload.addEventListener('progress', function(e) {  //Event called while upload is in progress

    if (progress !== undefined

            && e.lengthComputable) {

        $('#' + progress).html('<font>Uploading... ' + Math.round((e.loaded / e.total) * 100) + '%</font>');

    }

});



req.upload.addEventListener('load', function(e) {  //Event called when upload is completed

    $('#' + progress).html('<font>Retrieving updated data...</font>');

});



req.upload.addEventListener('error', function(e) {  //Event called when an error is returned by the server

    alert('An error has occurred...');

});



req.addEventListener('readystatechange', function(e) {        

    if (this.readyState === 4) {

        if (this.status === 200) {

            if (content !== undefined) {

                $('#' + content).html(this.response);

            }



            if (success !== undefined) {

                showChkMark(success);

            }

        } else {

            console.log('Server replied with HTTP status: ' + this.status);

        }





        if (progress !== undefined) {

            $('#' + progress).hide();

        }



        if (div_dlg !== undefined) {

            $('#' + div_dlg).dialog('close');

        }



        $('#' + file)

        .attr('disabled', false)

        .val('');

    }

});



if (progress !== undefined) {

    $('#' + progress).show();

}



$('#' + file).attr('disabled', true);

url += (

        url.indexOf('?') === -1

        ? '?'

        : '&'

    );

url += 'lnk_id=' + lnk_id + '&file=' + file;

req.open('POST', url);

req.setRequestHeader('Cache-Control', 'no-cache');



if (start_func !== undefined) {

    start_func.apply();

    setTimeout(function() {

        req.send(frm_data);

    }, 500);

} else {

    req.send(frm_data);

}}