Edit in JSFiddle

Result
JavaScript
HTML

   //show
  $("#btn1").click(function () {
    $("#showBlock").show();
  });
  
  //hide
  $("#btn2").click(function () {
    $("#showBlock").hide();
  });
  
  //transfer element show and hide
  $("#btn3").click(function () {
    $("#showBlock").toggle();
  });

<body>
  <!-- show element -->
  <input type="button" id="btn1" value="showBtn"/> 
   <!-- hide element -->
  <input type="button" id="btn2" value="hideBtn"/>  
  <!-- transfer element show and hide -->
  <input type="button" id="btn3" value="switchBtn"/>  
  <!-- Block -->
  <div id="showBlock" style="display:none;">
    hi
  </div>  
</body>