/* Call the a web method on a page */
function CallWebMethod(page,method,data,OnSuccess){
     $.ajax({
      type: "POST",
      url: page + "/" + method,
      data: "{data:" + JSON.stringify(data) + "}",
      contentType: "application/json; charset=utf-8",
      dataType: "json",
      success: function(msg) {
        // Replace the div's content with the page method's return.
        OnSuccess(msg.d);
      }
    });
}