This highlighter has simple highlighting features as well as balloons that pop up if you are mentioned when mirc is minimized. Double clicking on a balloon opens mirc up to the room you were mentioned.

on $*:TEXT:/\b/Sgi:#: {
  if ($chan != $active) && ($me isin $1-) { 
    window -De @highlighter 0 0 450 160 arial 13
    echo -t @highlighter  $time $nick is speaking of you on $+($chan,:,$1-)
    if (!$appactive) { $tip(high,Highlight,$+($chan,:,$nick,:,$1-),5,$null,$null,balloon,$chan) | set %highchan $chan }
    if ($appactive) { echo -a  $time $nick is speaking of you on $+($chan,:,$1-) }
  }
}
alias balloon { showmirc -r | window -a %highchan | unset %highchan }