An SVG grouped Bar chart

This is a grouped Bar chart that has an offset X axis and also uses the grow() effect and a key so that you can differentiate the different colored bars.

This goes in the documents header:
<script src="RGraph.svg.common.core.js"></script>
<script src="RGraph.svg.common.key.js"></script>
<script src=""></script>
Put this where you want the chart to show up:
<div style="padding: 15px">
    <div style="width: 750px; height: 300px" id="chart-container"></div>
This is the code that generates the chart:
    new RGraph.SVG.Bar({
        id: 'chart-container',
        data: [ [1,-2], [4,5], [4,2], [6,9], [4,3], [4,-3], [-4,8] ],
        options: {
            colors: ['#7CB5EC','#434348'],
            xaxisLabels: ['Monday','Tuesday','Wednesday','Thursday','Friday','Saturday','Sunday'],
            xaxis: 'rgba(0,0,0,0.5)',
            yaxis: false,
            grouping: 'grouped',
            hmargin: 20,
            hmarginGrouped: 5,
            yaxisScaleMax: 20,
            yaxisScaleMin: -5,
            title: 'A grouped Bar chart',
            key: ['Richard', 'Barry'],
            marginTop: 50