using Sais's code, you coudl even just do.
on *:JOIN:#myteam: { $+(.timer.on.join.web.ad.to.,$nick) 1 4 if ( $nick isreg $chan ) $({,) .msg $nick Please login to the admin
http://www.mysite.com/admin/ $(},) }
this well avoid a join part flood mass pm as well.