$(document).ready(function() {
  $("#head .left a img,.mi .layer_02 a img,.mi .layer_03 a img,.mi .layer_04 a img,.banner a img,.s_right p a img,.s_left a img")
  .hover(
    function() {
      $(this).fadeTo(200, 0.5);
    },
    function() {
      $(this).fadeTo(500, 1.0);
    }
  );
});