A scrolling SVG Line chart

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This goes in the documents header:
<script src="RGraph.svg.common.core.js"></script>
<script src="RGraph.svg.line.js"></script>
Put this where you want the chart to show up:
<div style="width: 750px; height: 300px" id="chart-container"></div>
This is the code that generates the chart:
<script>
    line = new RGraph.SVG.Line({
        id: 'chart-container',
        data: RGraph.SVG.arrayFill({
            array:  [],
            value:  0,
            length: 300
        }),
        options: {
            hmargin: 0,
            title: 'A scrolling SVG Line chart',
            gutterLeft: 50,
            gutterBottom: 50,
            yaxisMax: 50,
            yaxisMin: -25,
            yaxisLabelsCount: 3,
            xaxisLabels: ['Monday','Tuesday','Wednesday','Thursday', 'Friday'],
            xaxisLabelsPosition: 'section',
            xaxisTickmarks: false,
            backgroundGridVlinesCount: 10,
            xaxisColor: '#aaa',
            yaxis: false,
            backgroundGridColor: '#eee',
            backgroundGridVlines: false,
            backgroundGridBorder: false,
            backgroundGridHlinesCount: 3,
            filled: true,
            colors: ['#c00'],
            linewidth: 1,
            filledColors: ['rgba(255,0,0,0.25)']
        }
    }).draw();





    function update ()
    {
        // A global
        last = (window.last || (Math.random() * 75 + -25)) + (Math.random() * 4 - 2);
        last = Math.min(50, last);
        last = Math.max(-25, last)

        line.originalData[0].push(last);
        line.originalData[0].shift();

        RGraph.SVG.redraw();

        setTimeout(function ()
        {
            update()
        }, 50);
    }

    update();
</script>

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