<script src="jquery-cdn-xxx.js"></script>

<script>
$(document).ready(function(){

  $("#hide").click(function(){
    $("p").hide("slow");
  });

  $("#show").click(function(){
    $("p").show("slow");
  });

});
</script>


<p>xxx</p>
<button id="show">Show</button>
<button id="hide">Hide</button>