How do I change z-order depending on position

I have a bunch of enemys running around on a sidescroller with a little depth. So enemys can have higher or lower y-value than the other. But sometimes the enemy with higher y-value appears to be below another enemy with a lower y-value. How do I fix that? Since the enemys are the same object i can not campare self.y to enemy.y. Thanks in advance

Run a For Each (ordered) loop sorted by the expression enemy.y, order ascending, then add an action to send the current enemy to the front. That will order all of your enemies properly relative to each other, then it's just a matter of properly ordering your other objects among them.

Oh, that sounds like it's going to work. Thanks linkman2004 I'm gonna try that when i get home.