BAN 20 ID IN ONE TIME

send this xml code:

<iq id="your-id" to="room-
[You must be registered and logged in to see this link.]"
type="set"><query
xmlns="http://jabber.org/
protocol/muc#admin"><item
affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/
><item affiliation="outcast"
jid="ban-id@nimbuzz.com"/></
query></iq>

enjoy !!!