Download PNG on button click

Created using FusionCharts Suite XT - www.fusioncharts.com

HTML

<script src="http://static.fusioncharts.com/code/latest/fusioncharts.js"></script>
<script src="http://static.fusioncharts.com/code/latest/fusioncharts.charts.js"></script>
<script src="http://static.fusioncharts.com/code/latest/themes/fusioncharts.theme.fint.js"></script>
<!-- Exporting/downloading charts in different formats using FusionCharts Export chart feature. Clicking on the top right button opens the options to choose from. # exportEnabled - set to 1. Setting this attribute to 1 shows a button at top right corner of the chart canvas and lets user to choose exporting the chart to images/PDFs. -->
<div id="chart-container">FusionCharts will render here</div>
<div id='controllers' style='position:relative;text-align:center'>
    <input id='exportpdf' type='Button' value='Download' />&nbsp;&nbsp;</div>
<meta http-equiv="Pragma" content="no-cache"/>
<meta http-equiv="Expires" content="-1"/>
<style type='text/css'>
.rn_ScreenReaderOnly{position:absolute; height:1px; left:-10000px; overflow:hidden; top:auto; width:1px;}
.rn_Hidden{display:none;}
</style>
<base href='http://walmartjump--tst1.custhelp.com/euf/rightnow/optimized/1417691890/themes/standard/'></base>
<style type="text/css"></style>

</head>

JavaScript

FusionCharts.ready(function(){
		  		var dataSource = {
				   "chart": {
				      "caption": "Website visits",
				      "subcaption": "Purchase - Conversion analysis for last year",
				      
              "exportEnabled":"1",
				      "plotTooltext": "Success : $percentOfPrevValue",
				      "theme": "fint"
				   },
				   "data": [
				      {
				         "label": "Unique Website Visits",
				         "value": "1460000"
				      },
				      {
				         "label": "Programme Details Section Visits",
				         "value": "930000"
				      },
				      {
				         "label": "Attempts to Register",
				         "value": "540000"
				      },
				      {
				         "label": "Successful Registrations",
				         "value": "210000"
				      },
				      {
				         "label": "Logged In",
				         "value": "190000"
				      },
				      {
				         "label": "Purchased on Introductory Offers",
				         "value": "120000"
				      }
				   ]
				};
              FusionCharts.options.SVGDefinitionURL='absolute';
		      var revenueChart = new FusionCharts({
		        "type": "pie2d",
		        "renderAt": "chart-container",
		        "width": "500",
		        "height": "300",
		        "dataFormat": "json",
		        "dataSource": dataSource
		    });
		    revenueChart.render();
		});