Google annotated timeline
<p>I want to use Google Annotated Time Line to generate a graph using values generated from a PHP script, so far I have:</p>

<p></p>

<pre><code>  google.load('visualization', '1', {'packages':['annotatedtimeline']});
  google.setOnLoadCallback(drawChart);
  function drawChart() {
    var data = new google.visualization.DataTable();
    data.addColumn('date', 'Date');
    data.addColumn('number', 'Data');   
    data.addRows([

      [new Date($y1, 1, 1), $value_y1_1],
      [new Date($y1, 2, 1), $value_y1_2],
      [new Date($y1, 3, 1), $value_y1_3],

    ]);

    var chart = new google.visualization.AnnotatedTimeLine(document.getElementById('chart_div1'));
    chart.draw(data, {displayAnnotations: true});
  }
&lt;/script&gt;  
</code></pre>

<p>I want to add more monthly data points, from $y1 to $y80,  with the corresponding $value. I used a for loop but got "undefined variable" error. Suggestions?</p>

<p>Thanks!</p>
