$(document).ready(function(){
  var prev_content = $("#body_content").html();
  var timeout = null;
  var _f = function(){
    $('.ajax-loading').show()
    var value = $('#id_search')[0].value;
    if (timeout != null){
          window.clearTimeout(timeout);
    }
    timeout = window.setTimeout(function(){
        if (value == ""){
          $('.ajax-loading').hide()
          $("#body_content").html(prev_content);
        }else{
          $('.ajax-loading').show()
          $.post("/ajax/",{"search":$('#id_search')[0].value},function(html){
            $("#body_content").html(html);
            $('.ajax-loading').hide()
          });
        }
      timeout = null;
    },2000);
  };
  $('#id_search').keyup(_f);
  $('#id_search').change(_f);
});