Easiest way to use the right mouse button?

I'm trying to make a simple board game prototype and want to make left clicking on a piece return a list of tiles the piece can move to, and right clicking return a list of tiles the piece can attack.

I've read a little bit and cant find a simple solution,
I've been doing this for left clicking:

Code (CSharp):

1.     void OnMouseUpAsButton(){
2.         if (onTile.ally)
3.             Board.S.Clicked (this);
4.         if (onTile.onDeck)
5.             Board.S.Clicked (this);
6.     }

What do you suggest for right clicking?

 

The Unity documentation is your friend
http://docs.unity3d.com/ScriptReference/Input.GetMouseButtonDown.html
This covers left, right and middle mouse button usage.

 

Code (csharp):

1.  
2. if(Input.GetMouseButtonUp(1)){
3.     //Do something!
4. }
5.  

It's that easy