Collision Detection - AGAIN

[Canned]

I got it so when I bump infront, they dont go through each other. Yet when I go to bump from behind, They literally swap places. So I wrote this code to stop it from doing that:

code:

if x1 > x4 and x3 < x2 and y4 < y1 and y3 < y2 then         x1 := x1 + 5         x2 := x2 + 5         x3 := x3 - 5         x4 := x4 - 5     end if

and when I go to bump from behind, they push away from each other, and I cant stop it. Any help?