metabox upload file

Again. If you are using file upload, it is different than image upload. To get a FILE url, use: $(html).attr(‘href’);

File upload:

window.send_to_editor = function(html){
    var file_url = $(html).attr('href');

    // Do something with those variables

    tb_remove();
};

Image upload:

window.send_to_editor = function(html){
    var file_url = $('img', html).attr('src'),
        classes  = $('img', html).attr('class'),
        id       = classes.replace(/(.*?)wp-image-/, '');

    // Do something with those variables

    tb_remove();
};