function go_search(url) {
  window.location = url + "search/index&pattern=" + $("#pattern").val();
}

function remove_avatar(url, id) {
  $.ajax({
    url: url,
    type: "POST",
    data: ({
      id: id
    }),
    success: function(html){
      $("#div_avatar").html(html);
    }
  });
}