function RefreshMissionsAjax() {
  //fade out the old table.
  $(clientID('MissionsDisplay')).fadeOut(500);

  //request the new value from the page (calls the GetIncompleteMissions() method in the MissionViewer.aspx.cs page)
  $.ajax({
      type: "POST",
      url: "MissionViewer.aspx/GetIncompleteMissions",
      data: "{}",
      contentType: "application/json; charset=utf-8",
      dataType: "json",
      success: function (msg) {

      $(clientID('MissionsDisplay')).html(msg.d);
      $(clientID('MissionsDisplay')).fadeIn(500);
    },
    error: function (xhr, ajaxOptions, thrownError) {
        $(clientID('MissionsDisplay')).html('An error occured while trying to refresh the page data.');
        $(clientID('MissionsDisplay')).fadeIn(500);
    }
  });
}

[WebMethod]
public static string GetIncompleteMissions()
{
    return GetHTMLTable();
}