Problem submitting file content in Internet Explorer

Im submitting my file through jquery by using Jform.js plugin and its working in Firefox but when i try it on IE8 file properly sumbitted but file upload control gets hidden and further more when i comment IE condition then the file upload control doesnt get hide but when i check Request.Files[0].ContentLength in my controller it have 0 value. This is my code and what may be im doing wrong? Im using Asp.net MVC and jquery-1.4.2

        var myform = document.createElement("form");    
        myform.style.display = "none"
        myform.action = "/Media/AjaxSubmit";
        myform.enctype = "multipart/form-data";
        myform.method = "post";
        var imageLoad;
        var imageLoadParent;
        if (document.all) {//IE
            imageLoad = document.getElementById(fileId);
            imageLoadParent = document.getElementById(fileId).parentNode;
            myform.appendChild(imageLoad);
            document.body.appendChild(myform);
        }
        else {//FF          
                imageLoad = document.getElementById(fileId).cloneNode(true);
                myform.appendChild(imageLoad);
                document.body.appendChild(myform);          
        }    
        $(myform).ajaxSubmit({ success: function (responseText) {    
});

Solution is simple i just add that browse control when it response back from ajaxsubmit function and code is as follows

            $(myform).ajaxSubmit({ success: function (responseText) {
            if (document.all) {//IE
                imageLoadParent.appendChild(myform.firstChild);
            }
            else//FF                     
            {
                document.body.removeChild(myform);
            }