You can find a lot of examples at jqPlot Homepage - Examples.
The easiest example I can imagine:
In yout HTML-File have a div like this:
<div id="chart1"></div>
And in Your JavaScript do:
$(document).ready(function(){
var plot1 = $.jqplot ('chart1', [[3,7,9,1,4,6,8,2,5]]);
});
Of course you need to import the library of jqPlot and import it in your html file:
<!--[if lt IE 9]><script language="javascript" type="text/javascript" src="excanvas.js"></script><![endif]-->
<script language="javascript" type="text/javascript" src="jquery.min.js"></script>
<script language="javascript" type="text/javascript" src="jquery.jqplot.min.js"></script>
<link rel="stylesheet" type="text/css" href="jquery.jqplot.css" />