title: Update graph from json data
body: <p>I got a go program that outputs json data:</p>
  
  <pre><code>{ "cpu" : { 
        "Idle" : 9875425,
        "Iowait" : 28338,
        "Irq" : 5,
        "Nice" : 9707,
        "Softirq" : 4051,
        "System" : 153933,
        "Time" : 1329211407,
        "User" : 392229
  },
  "cpu0" : { 
        "Idle" : 2417441,
        "Iowait" : 3212,
        "Irq" : 5,
        "Nice" : 1419,
        "Softirq" : 3935,
        "System" : 62177,
        "Time" : 1329211407,
        "User" : 109227
      },
  }
  </code></pre>
  
  <p>I'm looking for a good efficient way to present and update a graph using javascript (say for every 1s).</p>