I am trying to run the same code in this jsFiddle locally but I got error from firebug
uncaught exception: Highcharts error #13: www.highcharts.com/errors/1
I think I know why you should add that tag after the div /div. If you are using a JSP or any other server-side stuf. You should add your Highcharts script after the declaration of the div container so it can recognize your div's id and then proceed to render it. Just like I did in the example bellow:
HighCharts :D