use the example by raver lsd
[img width=200]http://i43.tinypic.com/1el3kn.jpg[/img]
Up, within range, not on cooldown.
[img width=200]http://i42.tinypic.com/2ry39s0.jpg[/img]
Out of range from it.
[img width=200]http://i39.tinypic.com/bdqubn.jpg[/img]
On cooldown.
Are numerous setup but this is the one I settled for.