determining click location

Hello,

I am working on a project that will allow the user to click on a large number of areas within a single game board (think Twister).

I have a single texture depicting the board that I was intending to use. In order to recognize the click on each specific circle do I need to drop an invisible prim on top of each spot or is there a way to determine where on a single prim the user clicked?

Is there any other way to give lots of UI "touch" options without using such a large amount of prims?

Any feedback is appreciated.

- JP

Touch
That was a bit of code written by Jeffery Gomez, it only works in mouselook though. Hope that helps.