How detect my internet connection without using navigator

Question

Hi all,

        I need to detect whether Internet connection is there when my script loads, i used navigator.online it says" connection is there " if the PC in LAN and able to connect to internet, and also the path to my Gmap js files should load according the connection settings online and offline settings intially i tried

   $(document).ready(function () {

              $.ajax({

                  url: 'http://in.yahoo.com/',

                  success: function (data) {

                      alert('Connection.');

                  },

                  error: function (data) {

                      alert('No Connection.');

                  }

              });

          });

but this is also not working.

iam getting error like XMLHttpRequest cannot load http://in.yahoo.com/. Origin http://localhost:40624 is not allowed by Access-Control-Allow-Origin.

For which i added 

protected void Application_BeginRequest(object sender, EventArgs e) { HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*"); }

 in my Global.asax file

PLs suggest me i nearly spend a Day in searching,pls help me out