Bar charts with background horizontal bars

[No canvas support]
[No canvas support]

This goes in the documents header:
<script src="RGraph.common.core.js"></script>
<script src="RGraph.bar.js"></script>
Put this where you want the charts to show up:
<canvas id="cvs" width="600" height="250">[No canvas support]</canvas><br />
<canvas id="cvs2" width="600" height="250">[No canvas support]</canvas>
This is the code that generates the chart:
<script>
    new RGraph.Bar({
        id: 'cvs',
        data: [[21,31],[13, -5],[-12, -58],[5, 29],[59, 28],[40, 10]],
        options: {
            colors: ['blue', 'red'],
            xaxisPosition: 'center',
            xaxisLabels: ['2007', '2008', '2009', '2010', '2011', '2012'],
            backgroundHbars: [
                [-55,-5,'rgba(255,0,0,0.2)'],
                [-45,-10,'rgba(255,255,0,0.2)'],
                [-45,90,'rgba(0,255,0,0.2)'],
                [45,10,'rgba(255,255,0,0.2)'],
                [55,null,'rgba(255,0,0,0.2)']
            ],
            colorsStroke: 'rgba(0,0,0,0)'
        }
    }).draw();

    new RGraph.Bar({
        id: 'cvs2',
        data: [[21,31],[13, 5],[12, 19],[5, 29],[59, 28],[40, 10]],
        options: {
            colors: ['blue', 'red'],
            xaxisLabels: ['2007', '2008', '2009', '2010', '2011', '2012'],
            backgroundHbars: [
                [-55,-5,'rgba(255,0,0,0.2)'],
                [-45,-10,'rgba(255,255,0,0.2)'],
                [-45,90,'rgba(0,255,0,0.2)'],
                [45,10,'rgba(255,255,0,0.2)'],
                [55,null,'rgba(255,0,0,0.2)']
            ],
            colorsStroke: 'rgba(0,0,0,0)'
        }
    }).draw();
</script>