jQuery Flot + getJson

jQuery Flot + getJson

Hello everyone,
I'm a newbeginner and need some help on a tutorial i'm working on...

I'm trying to draw a simple graph using jQuery Flot + ASP.Net mvc
so here is the method i added in HomeController:

public ActionResult Example()
        {
            string s = "[[[2003,10882],[2002,10383],[2001,10020], [2000, 9213]]," +
                "[[2003, 599],[2002, 510],[2001, 479],[2000, 457]]]";
            return Json(s, JsonRequestBehavior.AllowGet);
        }

and here is the javascript code i wrote in the index.aspx page

$(function () {
            $.getJSON("../../Home/Example", function (data) {
                alert('json: ' + data + ' ...');
                var plotarea = $("#plot_area");
                $.plot(plotarea, data);
            });
        });

so when alerting i get the data that i'm sending from the controller, but i get only an empty graph with no data!

what am i doing wrong???

thanks a million for your help in advance...

Lina