We remove the data arrays for revenue and the overall profit array. We also add data to the three arrays containing the divisional profits:

<script src="../js/jqplot.dateAxisRenderer.min.js"></script>
<script>
$(document).ready(function(){
  var electronics = [["2011-11-20", 123487.87], ...];
  var media = [["2011-11-20", 66449.15], ...];
  var nerd_corral = [["2011-11-20", 2112.55], ...];

  var div_profit = $.jqplot ('division_profit', [media, nerd_corral, electronics],
  {
    title:'12 Month Divisional Profits',

Under seriesDefaults, we assign true to fill and fillToZero. Without setting fillToZero to true, the fill would continue to the bottom of the chart. With the option set, the fill will extend downward to zero on the y axis for positive values and stop. For negative data points...