How do I apply my AI to every enemy?

I've made a system to make the enemy follow my player on a 4direction movement base and avoid walls, it works ok for 1 enemy but as soon as I try to clone it and add some others bad guys, things get messed up.

Here's my capx https://dl.dropboxusercontent.com/u/55828593/simpleAI.capx if anyone can help.

Hello

Your global variable "dir" should be an instance variable of the ennemy sprite to be unique to each ennemies

thanks, how I missed that >_<