Save jQuery from jQuery download Link and save it in a folder name xyz. In same folder copy the following code with the .html. Now run the HTML page. works fine for me.
<html>
<head>
<script src="jquery-1.10.2.js"></script>
</head>
<body>
<div>hello how are you</div>
<p>See it is working</p>
<script>
$(document).ready(function() {
$("body").css("display", "none");
$("body").slideDown(1).delay(2000).slideUp("slow");
});
</script>
</body>
</html>