var charts = 
{
	// utility class
	utility:
	{
		chartColors: [ themerPrimaryColor, "#444", "#777", "#999", "#DDD", "#EEE" ],
		//chartBackgroundColors: ["transparent", "transparent"],
		chartBackgroundColors: ["rgba(255,255,255,0)", "rgba(255,255,255,0)"],

		applyStyle: function(that)
		{
			that.options.colors = charts.utility.chartColors;
			that.options.grid.backgroundColor = { colors: charts.utility.chartBackgroundColors };
			that.options.grid.borderColor = charts.utility.chartColors[0];
			that.options.grid.color = charts.utility.chartColors[0];
		},
		
		// generate random number for charts
		randNum: function()
		{
			return (Math.floor( Math.random()* (1+40-20) ) ) + 20;
		}
	}
	
};