Switching help

[Beef]

I need help with switches. Ok, here's what I want to do. I'm terran and my enemy's Zerg. I want to create one marine at "create marine" every 1 kill. I've tried to use some sample switches from another thread but they didn't help. :cry:

[P-OnMeToWin]

Player:
Your human player

Conditions:
Foes has suffered atleast 1 deaths of any unit.

Actions:
Set deaths for foes: subtract 1 for any unit.
Create 1 marine for current player at create marine.

Hope that helps.