Err... kinda feeling bad now. I'm really sorry but now it doesn't work like before.
See, this how the button is supposed to play when the mouse rolls over. It plays the green lights while the mouse is over it, and continuous to play until the mouse roll out. BUT it will not stop right away, instead it will keep going until it reaches the fifth light then it will stop. So if say there's 5 of those buttons on stage... and you move your cursor above all 5 of them, one after another, it will create a chain reaction animation even if the mouse is already somewhere else.
So in short, when the cursor is above -> plays lights
cursor out -> continuous to play lights until the last one