You need to call add_action from outside the class, with a reference to the object. Example:
$cj = new Cronjobs;
add_action('update_properties_daily', array(&$cj, 'do_updates'));
You need to call add_action from outside the class, with a reference to the object. Example:
$cj = new Cronjobs;
add_action('update_properties_daily', array(&$cj, 'do_updates'));