[Level 3] How to disable mouse pad?

The mouse pad always make me confuse~
Because whiling typing, I'll touch it, and sometime the mis-operation will just close my working screen. It will make me crazy.
Therefore, I write a script to disable the mouse pad,
at this moment, only the external mouse is active.

But, when I try to enable it, I find out that I cannot enable it, it's that a bug???
Whatever, if you have the same problem, just remove your external mouse,
and the touch pad will be active again.

Just enjoy it~

#!/usr/bin/bash
showUsage() {
  cat <<EOF
Usage:
  $0 (d)isable/(e)nable
Ex.
  $0 (d)isable
  $0 (e)nable
Note.
  for solaris only
EOF
}
disableMousePad() {
  [ ! -z "$modno" ] && pfexec modunload -i $modno
}
enableMousePad() {
  [ ! -z "$modname" ] && pfexec modload /kernel/drv/amd64/$modname
}
showMousePad() {
  echo "Show mod info:"
  pfexec modinfo | grep mouse | grep PS/2
}
################################################## main
export LC_ALL=C
modno=`pfexec modinfo | grep mouse | grep PS/2 | awk '{print($1)}'`
modname=`pfexec modinfo | grep mouse | grep PS/2 | awk '{print($6)}'`
if [ ! -z "$modname" ]
then
  echo "$modname" >> $0.mousepad
elif [ -f $0.mousepad ]
then
  modname=`cat $0.mousepad | head -1`
else
  echo "missing modname info, exit program..."
  exit 1
fi
#set -vx
#sAction=`echo $1 | /usr/bin/tr [A-Z] [a-z]`
sAction=$1
case $sAction in
disable|d|DISABLE|D)
  disableMousePad
  showMousePad
  ;;
enable|e|ENABLE|E)
  enableMousePad
  showMousePad
  ;;
*)
  echo "Error with wrong action($1), exit program..."
  showUsage
  ;;
esac

Wish this helps.

regards,
Stanley Huang