how to remove jid?

Tue May 26 13:10:38 UTC 2009

Hi,

Running FreeBSD 6.2, with jail,
I hage the following jids shown in the jls command:

# jls
   JID  IP Address      Hostname                      Path
    10  125.255.1.6 wp.ipx.com.au                 /usr/jails/wp
     8  125.255.1.6 wp                            /usr/jails/wp
     7  125.255.1.6 wp                            /usr/jails/wp
     1  125.255.1.6 wp1.ipx.com.au                /usr/jails/wp1

There is only wp.ipx.com.au valid in the list, others are not exists.
How to remove JID 8,7, and 1?

Thanks