He probado probando esto.... if
(isset ($_SESSION['listados'])) {
$a=$_SESSION['listados'];
$a->paginando();
$listados = unserialize(urldecode($_SESSION['listados']));
}
else
{$listados= new listados;} y da el siguiente error... Fatal error: main() [<a href='function.main'>function.main</a>]: The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition "listados" of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide a __autoload() function to load the class definition he puesto un echo $_SESSION['listados'] y no impriome nada como si la sesion estubiera vacía.