Little Help Needed ? Well lot of help

[Jsmoke]

im trying to write a small snipit of code. say im a user on ntl.com the isp and im the op on a channel called #ntl_users ,what i want to do is kick and ban any isp that doesnt match anyone@ntl.com so in fact anyone that joins channel #ntl_user unless ther mask , address does not match *.ntl.com get kick and banned ,anyone that matches gets on the channel with a small welcome note..

on *:JOIN:#ntl_user:{
if (ntl.com) isin $address) msg # welcome, $nick
ifnot (ntl.com) isin $address) kick # $nick banned
}
this bit above dont work.. someone put me on the right track

[Riamus]