We need to configure the location of the charts.swf file, which defaults to the 
	http://yui.yahooapis.com/2.7.0/build/charts/assets/charts.swf
	
	If the application is riding on HTTPS, this URL would most likely cause the browser to display 
	a security warning. And if your Application is within a secured intranet, the client's browser
	may not have access to outside.
	Configuring chars to require the SWF file from the local intranet server will help
	mitigate this issue:
	
	Ext.chart.Chart.CHART_URL = '.. path to charts.swf..';
	
	This is similar to setting the BLANK_IMFAGE_URL('s.gif')