error file uploading using blueimp

I am trying to upload file by blueimp file upload.I use very simple code for testing but the code is not working.In firefox error console there is two error

• Error: TypeError: $.ajaxTransport is not a function

• Error: TypeError: $.support is undefined

Here is my code

<input id="fileupload" type="file" name="picture"/>
<input type='button' id='sub'/>


$('#sub').click(function () {
$('#fileupload').fileupload({
    url: 'php/index.php',
   // dataType: 'json',
    done: function (e, data) {
        $.each(data.result.files, function (index, file) {
            $('<p/>').text(file.name).appendTo(document.body);
        });
    }
});
});

And after clicking button another error has occured

• Error: TypeError: $(...).fileupload is not a function

  That means the plugins function is not working.please help.thanks in advance.