function LoginUser()
{
   $("#login_results").html( "" );
   $.ajax( {
      type: "POST",
      url: "checklogin.php",
      data : {
        data : $.toJSON( $("#login_box").inputs() )
      },
      success : function( responseData )
      {
         response = $.evalJSON( responseData );
         if( response.success )
            location.reload( true );
         else
            $("#login_results").html( "Invalid username or password.<br />Please try again.");
      },
      error : function( request, message )
      {
         alert( "unexpected error: " + message );
      }
    });
}

function LogOff()
{
   $.ajax( {
      type: "POST",
      url: "logoff.php",
      data : {
        data : null
      },
      success : function( responseData )
      {
         window.location = "index.php";
      },
      error : function( request, message )
      {
         alert( "unexpected error: " + message );
      }
    });
}