Spawn Tigger

Ok, i am a complete trigger noob....so dont make fun of me, lol. Can someone tell me how to make a spawn trigger, like, if i start with building A, and i want it to spawn unit Z every 5 secs, but then if i upgraded to building B have it spawn unit X. How would i do that. Its for a footmanwars-type map.

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ok so first you Make a variable called spawn1 and one called spawn 2

Events: Time- Every 5.00 seconds of the game.

Conditions: (Number of units in (Units owned by Player 1 (Red) of type building A Equal to 1
(Building A is alive) Equal to true

Actions: Unit- Create X amout of whatever at region whatever.
Trigger- Turn off (spawn1)
Trigger- Turn on (spawn1)

O then make this trigger so that when you upgrade this trigger will run

Events: Time- Every 5.00 seconds of the game.

Conditions: (Number of units in (Units owned by Player 1 (Red) of type building B Equal to 1
(Building A is alive) Equal to true

Actions:Trigger- Turn off (spawn1)
Unit- Create X amout of whatever at region whatever.
Trigger- Turn off (spawn2)
Trigger- Turn on (spawn2)

Hope this works

will the spawn the units continually?

and wat do you mean by make a variable

ok there is a gold X above trigger comment... click that and make a variable.

Yes So when you have building A it spawns w/e units you want... then... when you get building B it stops spawning th units from building A and starts spawing units for building B

wat type of variable

variable type=to a trigger

Thanks guys, that last one works. O and if i wanna stop the trigger i can just do something like, whenver someone upgrades to the next building, it stops the the one spawning the first unit?

Event: unit finish an upgrade
Condition:unit type of triggering unit equal to whatever
Action:
-Turn off spawn unit1
-Turn on spawn unit2