Enemies

Hello flash developers. I need some help. I made flash platformer (using AS2). I made moving hero and coin to collect and i’ve stucked. I want to add enemies into game. It should work like this: if enemy is near it hits hero and hero lose hit points. same for hero and enemy. I know it’s not so easy bu i hope i’ll get help for game developing. Thank you, and sorry for my bad english.

Here’s my source file