5. JavaScript Library
jQuery is designed to change the way that you write JavaScript.
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<script src="jquery.js"></script>
<script>
$(‘div’).show();
</script>
http://jquery.com/
6. $(‘Selectors’). method(...);
example
$(‘#box1’). hide();
$(‘.box2 a’). fadeout();
$(‘#box1, .box2 a’). show();
$(‘div’). css(‘display', none);
http://oscarotero.com/jquery/
API [Application Program Interface]
http://visualjquery.com/