Something

on *:JOIN:#: {
  if ($nick iswm %staff) {
    if ($nick iswm %headbs1) { 
      /msg $chan [3Invigorated1]: %messagebs1
    }
    else {
      on *:JOIN:#: {
        if ($nick iswm %staff1) { 
          /msg $chan [3Hi2u1]: %message1
        }
        else {
          on *:JOIN:#: {
            if ($nick iswm %staff2) { 
              /msg $chan [3Thehotnewguy1]: %message2
            }
            else {
              on *:JOIN:#: {
                if ($nick iswm %staff3) { 
                  /msg $chan [3Llama1]: %message3
                }
                else { /halt }
              }
            }
          }
        }
      }
    }
  }