why i can not routes two point in google-map-jquery?

Question

Hi. i how you can help me.

 i want to computes routes between two points that input in 4 textbox . whats my problem?

my program is this:

 <script type="text/javascript">
    $(document).ready(function ()
    {       
        var nFirst = $('#<%= TextBox3.ClientID %>').val();
        var nSecond = $('#<%= TextBox4.ClientID %>').val();
        var bFirst = $('#<%= TextBox1.ClientID %>').val();
        var bSecond = $('#<%= TextBox2.ClientID %>').val();
        $("#map").googleMap();
        $("#map").addWay(
        {
              start: [parseInt(nFirst),parseInt(nSecond)], // Postal address for the start marker (obligatory)
              end:  [parseInt(bFirst),parseInt(bSecond)], // Postal Address or GPS coordinates for the end marker (obligatory)
              route : 'way', // Block's ID for the route display (optional)
              langage : 'english' // language of the route detail (optional)
        });
       return false;
    });
</script>