Trigger GUI Text problem

I want my gui text to appear only when I enter a trigger, it would stay while I’m in the trigger but it would dissapear when I exit the trigger
the trigger would also delete itself after i exit it.
Can someone please point me in the right direction or show me a script?
Thanks.

not sure if this is what your looking for, but seen this post before, which is using a box collider for the gui text

http://forum.unity3d.com/threads/37924-How-can-I-trigger-GUI-Text-using-a-Box-Collider