If you take a simple gauge example like:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://
www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml";>
  <head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8"/
>
    <title>
      Google Visualization API Sample
    </title>
    <script type="text/javascript" src="http://www.google.com/jsapi";></
script>
    <script type="text/javascript">
      google.load('visualization', '1', {packages: ['gauge']});
    </script>
    <script type="text/javascript">
      function drawVisualization() {
        // Create and populate the data table.
        var data = new google.visualization.DataTable();
        var x=Math.floor(Math.random()*100);
        data.addColumn('string', 'Label');
        data.addColumn('number', 'Value');
        data.addRows(1);
        data.setValue(0, 0, 'Memory');
        data.setValue(0, 1, x);

        // Create and draw the visualization.
        new google.visualization.Gauge(document.getElementById
('visualization')).
            draw(data, null);
      }


      google.setOnLoadCallback(drawVisualization);
    </script>
  </head>
  <body style="font-family: Arial;border: 0 none;">
    <div id="visualization" style="width: 300px; height: 300px;"></
div>
  </body>
</html>

How would I modify this code to update every 30 seconds and display a
new value without refreshing the whole page?

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