How to export kendoui dataviz chart to (.png) or (.jpg) image format by poping up Save-As window?

I am using kendoui dataviz charts, and I need to export those charts into (.png) or (.jpg) image format. Basically kendoui dataviz chart has a built-in method called 'svg()'.

'svg()' Returns the SVG representation of the current chart. The returned string is a self-contained SVG document.

Example

var chart = $("#chart").data("kendoChart");
var svgText = chart.svg();

code example: I tried this, but it doesn't prompt any 'SaveAs' popup

     <div id="example" class="k-content">
              <div class="chart-wrapper">
                  <div id="chart"></div>
                     <center>
                        <div>
                          <input type="button" value="click" onclick="disp();" />
                        </div>
                     </center>
                  <div>
      <canvas id="canvas"></canvas>
      </div>
        </div>
           </div>


          <script type="text/javascript">

            function disp() {
                var chart = $("#chart").data("kendoChart");
                var svgText = chart.svg();
                var c = document.getElementById('canvas');
                canvg(c,svgText);
                var img    = c.toDataURL("image/png");
                document.write('<img src="' + img + '"/>');
                window.win = open(imgOrURL);
                setTimeout('win.document.execCommand("SaveAs")', 100);
                }

              function createChart() {
                $("#chart").kendoChart({
                    theme: $(document).data("kendoSkin") || "default",
                    title: {
                        text: "Internet Users"
                    }