$("button").click(function(e) {
      var adiv = $("div").get(0);
      var value;

      switch ($("button").index(this)) {
        case 0 :
          value = jQuery.data(adiv, "blah");
          break;
        case 1 :
          jQuery.data(adiv, "blah", "hello");
          value = "Stored!";
          break;
        case 2 :
          jQuery.data(adiv, "blah", 86);
          value = "Stored!";
          break;
        case 3 :
          jQuery.removeData(adiv);
          value = "Removed!";
          break;
      }

      $("span").text("" + value);
    });