A basic Funnel chart

[No canvas support]

This goes in the documents header: 
<script src="RGraph.common.core.js"></script>
<script src="RGraph.funnel.js"></script>
Put this where you want the chart to show up: 
<canvas id="cvs" width="500" height="500">
    [No canvas support]
</canvas>
This is the code that generates the chart: