Candidate polls with prototype dygraphs drawing callback API

var srcs = [ "romney.png", "gingrich.png", "paul.png", "santorum.png", "perry.png"];
var images = [];
var loadCount = 0;
for (var i = 0; i < srcs.length; i++) {
  images[i] = new Image();
  images[i].addEventListener('load', function () {
    loadCount++;
    if (loadCount == srcs.length) {
      drawGraph();
    }
  }, false);
  images[i].src = srcs[i];
}
function drawGraph() {
  var xyz = {
    "Romney": images[0],
    "Gingrich": images[1],
    "Paul": images[2],
    "Santorum" : images[3],
    "Perry" : images[4]
  };
  g = new Dygraph(
        document.getElementById("demodiv"), data,
        {
          labels: ["Date","Romney","Gingrich","Paul","Santorum","Perry"],
          pointSize: 1,
          drawPoints: true,
          connectSeparatedPoints: true,
          drawPointCallback: function(g, series, ctx, cx, cy, color, radius) {
            var img = xyz[series];
            console.log(series, cx, cy);
          },
          width:2400,
          height: 800,
        }
  );
}