HighCharts already supports the image exporting functionality via the Exporting Module which is packaged with it. Exporting After getting it you should be able to modify the script to save the image in any way you need. It's certainly not a beginners task and will require lots of tinkering.
This might be a little late, but I stumbled across this via Google so it might help someone. Highchart's image is in SVG format: http://en.wikipedia.org/wiki/Svg , you need to convert that to a bitmap format image. You have to change the Highcharts exporting options URL to your own URL.
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