how to hide and show content using jquery?

<script src=”http://jqueryjs.googlecode.com/files/jquery-1.3.2.min.js” type=”text/javascript”></script>

<script type=”text/javascript”>

$(document).ready(function(){

    $("#btn").click(function () {

    $("p").toggle("fast");

  });

});

</script>

<button id="btn">Click Me</button>

<p>

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