Highstock Demo Gallery - Compare multiple series

$(function() {
	var seriesOptions = [],
		yAxisOptions = [],
		seriesCounter = 0,
		names = ['MSFT', 'AAPL', 'GOOG'],
		colors = Highcharts.getOptions().colors;

	$.each(names, function(i, name) {

		$.getJSON('http://www.highcharts.com/samples/data/jsonp.php?filename='+ name.toLowerCase() +'-c.json&callback=?',	function(data) {

			seriesOptions[i] = {
				name: name,
				data: data
			};

			// As we're loading the data asynchronously, we don't know what order it will arrive. So
			// we keep a counter and create the chart when all the data is loaded.
			seriesCounter++;

			if (seriesCounter == names.length) {
				createChart();
			}
		});
	});



	// create the chart when all data is loaded
	function createChart() {

		$('#container').highcharts('StockChart', {
		    chart: {
		    },

		    rangeSelector: {
		        selected: 4
		    },

		    yAxis: {
		    	labels: {
		    		formatter: function() {
		    			return (this.value > 0 ? '+' : '') + this.value + '%';
		    		}
		    	},
		    	plotLines: [{
		    		value: 0,
		    		width: 2,
		    		color: 'silver'
		    	}]
		    },
		    
		    plotOptions: {
		    	series: {
		    		compare: 'percent'
		    	}
		    },
		    
		    tooltip: {
		    	pointFormat: '<span style="color:{series.color}">{series.name}</span>: <b>{point.y}</b> ({point.change}%)<br/>',
		    	valueDecimals: 2
		    },
		    
		    series: seriesOptions
		});
	}

});

/**
 * Skies theme for Highcharts JS
 * @author Torstein Hønsi
 */

Highcharts.theme = {
   colors: ["#514F78", "#42A07B", "#9B5E4A", "#72727F", "#1F949A", "#82914E", "#86777F", "#42A07B"],
   chart: {
      className: 'skies',
      borderWidth: 0,
      plotShadow: true,
      plotBackgroundImage: '/demo/gfx/skies.jpg',
      plotBackgroundColor: {
         linearGradient: [0, 0, 250, 500],
         stops: [
            [0, 'rgba(255, 255, 255, 1)'],
            [1, 'rgba(255, 255, 255, 0)']
         ]
      },
      plotBorderWidth: 1
   },
   title: {
      style: {
         color: '#3E576F',
         font: '16px Lucida Grande, Lucida Sans Unicode, Verdana, Arial, Helvetica, sans-serif'
      }
   },
   subtitle: {
      style: {
         color: '#6D869F',
         font: '12px Lucida Grande, Lucida Sans Unicode, Verdana, Arial, Helvetica, sans-serif'
      }
   },
   xAxis: {
      gridLineWidth: 0,
      lineColor: '#C0D0E0',
      tickColor: '#C0D0E0',
      labels: {
         style: {
            color: '#666',
            fontWeight: 'bold'
         }
      },
      title: {
         style: {
            color: '#666',
            font: '12px Lucida Grande, Lucida Sans Unicode, Verdana, Arial, Helvetica, sans-serif'
         }
      }
   },
   yAxis: {
      alternateGridColor: 'rgba(255, 255, 255, .5)',
      lineColor: '#C0D0E0',
      tickColor: '#C0D0E0',
      tickWidth: 1,
      labels: {
         style: {
            color: '#666',
            fontWeight: 'bold'
         }
      },
      title: {
         style: {
            color: '#666',
            font: '12px Lucida Grande, Lucida Sans Unicode, Verdana, Arial, Helvetica, sans-serif'
         }
      }
   },
   legend: {
      itemStyle: {
         font: '9pt Trebuchet MS, Verdana, sans-serif',
         color: '#3E576F'
      },
      itemHoverStyle: {
         color: 'black'
      },
      itemHiddenStyle: {
         color: 'silver'
      }
   },
   labels: {
      style: {
         color: '#3E576F'
      }
   }
};

// Apply the theme
var highchartsOptions = Highcharts.setOptions(Highcharts.theme);