Code:
alias opme {
  set %opme [color:green]nickname[/color]
  ison %opme
}
raw 303:*:{
  if ( %opme ) && ( $2 == $null ) || ( $2 == %opme ) {
    if ( $2 == %opme ) {
      msg %opme [color:green]command[/color]
    }
    else {
      echo -a %opme isn't online.
    }
    unset %opme
    haltdef
  }
}
^Should work