How to populate param. value for the http://valums.com/ajax-upload/ javascript correctly?

How to populate param. value for the http://valums.com/ajax-upload/ javascript correctly?

I want to pass some image title by

 params: { 
     param1: imgTitle
 },

Where $("#ImageTitle").val(); refers to <input type="text" id="ImageTitle" name="ImageTitle" value="" />

Any help please!

Thank you!!!

UPDATES:

The final solution is here.

<script type="text/jscript">

                                var uploader = new qq.FileUploader({
                                    element: document.getElementById('file-uploader-demo1'),
                                    allowedExtensions: ['jpg', 'jpeg', 'png', 'gif'],
                                    sizeLimit: 2147483647, // max size
                                    action: '/TradeshowSpeakers/UploadFile',
                                    multiple: false,
                                    onSubmit: function (id, filename) {
                                        this.params.param1 = $("#ImageTitle").val();
                                    },
                                    onProgress: function (id, fileName, loaded, total) {
                                    },
                                    onComplete: function (id, fileName, responseJSON) {
                                        //alert(responseJSON[0].Image);
                                    }
                                });