Add value customize input (metabox) when upload files on WordPress. This functions is based in solution posted on stackoverflow: http://stackoverflow.com/a/5671763/1156665

gistfile1.js

/*
    save file upload customize input wordpress
    @return void
*/

function saveFileUpload(button, input) {
    var uploadID = ''; 
    jQuery(button).click(function() {
        uploadID = jQuery(this).prev('input');
        formfield = jQuery(input).attr('name');
        tb_show('', 'media-upload.php?type=image&TB_iframe=true');
        return false;
    });
    
    window.send_to_editor = function(html) {
        fileurl = jQuery(html).attr('href');
        uploadID.val(fileurl);
        tb_remove();
    };
}