Here we have a Radar chart that has been set to have a circular background grid instead of an angular one. Other than that it's a pretty standard Radar chart.
This goes in the documents header:<script src="RGraph.svg.common.core.js"></script> <script src="RGraph.svg.radar.js"></script>Put this where you want the chart to show up:
<div style="width: 500px; height: 400px" id="chart-container"></div>This is the code that generates the chart: