Health Bars above Enemies?

How does one make it so that a health bar appears above the enemy and stays above said enemy while camera angles change?

Is this done with a GUI? OR is this done with in Game Objects?

Thanks in advance

Ooops sorry guys just found this >.<

http://forum.unity3d.com/threads/26014-Health-bar-over-enemy

Anyone who had the same prob as me just check that link out

Sorry for pointless Question, but hey now it has an answer as well >.<