$squirrelmail_plugin_hooks['optpage_register_block']['filters'] = 'filters_optpage_register_block_hook';
$squirrelmail_plugin_hooks['special_mailbox']['filters'] = 'filters_special_mailbox';
$squirrelmail_plugin_hooks['rename_or_delete_folder']['filters'] = 'update_for_folder_hook';
$squirrelmail_plugin_hooks['optpage_register_block']['filters'] = 'filters_optpage_register_block_hook';
$squirrelmail_plugin_hooks['special_mailbox']['filters'] = 'filters_special_mailbox';
$squirrelmail_plugin_hooks['rename_or_delete_folder']['filters'] = 'update_for_folder_hook';