host=$1
user=$2
d=$3
: ${ssh_args:=}
[ -n "$d" ] || {
	echo >&2 usage: `basename "$0"` host user display-number
	exit 1
}
VNC_VIA_CMD="/usr/bin/ssh $ssh_args -l $user -f -L %L:%H:%R -p 2222 localhost echo %G \&\& sleep 20" xtightvncviewer -via $host -passwd $HOME/.vnc/passwd localhost:$d