I Need Help About Gates!!!

I Need Help About Gates!!!

Do somebody know how make to make a gate open by itself, etc;

When my Blademaster walks towards the gate and stands in front of it, then the gate opens and then the Blademaster go through, and when he is gone the gate closes again etc etc.

How do i make this happen?

regions....

make a region af the gate and make a trigger like this

a unit enters region 'gate'

actions:
open 'the gate'
wait 6 seconds
close 'the gate'


or a another trigger with:

a unit leaves region 'gate'

actions:
close gate

i dont have world editor open so it isnt correctly
but it shoeld be able to be done like this...