on *:INVITE:#: { 
  join # 
  .timer 1 2 CheckChan $chan $nick 
} 
alias -l CheckChan { 
  if ($2 !isop $1) && ($2 !ishop $1) { 
    part $1 Sorry, you need to be atleast halfop to invite $me $+ . 
  } 
  else { 
    msg $1 Hello $1 $+ , I was invited here by $2 $+ . Please type !Commands for a list of available commands. 
  } 
}