<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>