A clickable interactive Fuel chart

[No canvas support]

This goes in the documents header:
<script src="RGraph.common.core.js"></script>
<script src="RGraph.common.dynamic.js"></script>
<script src="RGraph.common.effects.js"></script>
<script src="RGraph.fuel.js"></script>
Put this where you want the chart to show up:
<canvas id="cvs" width="250" height="250">
    [No canvas support]
This is the code that generates the chart:
    var fuel = new RGraph.Fuel({
        id: 'cvs',
        min: 0,
        max: 100,
        value: 96,
        options: {
            scaleVisible: true,
            colors: ['Gradient(white:blue)'],
            needleColor: 'blue',
            scaleUnitsPost: '%'
    fuel.canvas.onclick = function (e)
        var obj   = e.target.__object__,
            value = obj.getValue(e);
        obj.value = value;