Or if your a more advanced user, you could have to collision boxes. then have a event like this:
system.OnStartOfLayout
-> Platform.setY(lerp(self.y, collsion1.y, 0.5*dt)
Platform.OnCollisionWith[collision1]
-> -> Platform.setY(lerp(self.y, collsion2.y, 0.5*dt)
Platform.OnCollisionWith[collision2]
-> -> Platform.setY(lerp(self.y, collsion1.y, 0.5*dt)
Something like that should do the trick <img src="smileys/smiley1.gif" border="0" align="middle" />