function CheckStatus(url)

        {

            XMLHTTP = new ActiveXObject("Microsoft.XMLHTTP")

            XMLHTTP.open("HEAD",url,false)

            XMLHTTP.send()

            return XMLHTTP.status==200

        }

        function NetPing()

        {

              return CheckStatus("http://www.163.com/index.html");

        }

function NetPing() {

    $.ajax({

        type: "GET",

        cache: false,

        url: "http://www.163.com/index.html",

        data: "",

        success: function() {

            Done(1);

        },

        error: function() {

            Done(0);

        }

    });

}