Forums Scripts & Popups Help with a timer and a countdown

I am very new to MIRC and have been searching a while for a countdown timer.
i found this script:

on *:text:!countdown*:#: {
if ($2 = 5) {
}
msg $chan Countdown started !
timer 1 1 msg $chan 5
timer 1 2 msg $chan 4
timer 1 3 msg $chan 3
timer 1 4 msg $chan 2
timer 1 5 msg $chan 1
timer 1 6 msg $chan Go !
}
else {
if ($2 > 5) {
msg $chan 1,12Sorry 13,12 $nick , 8,12but max countdown number for me is 5 !
}
}


This adds a countdown command. I want to repeat this countdown command say every 120 seconds. What needs to be added to this scrit? or is there something else i need to do? Please bare in mind im a complete n00b to all of this so any help will be very very greatfull. Will be using the command on my twitch channel.