Input.GetMouseButton

static function GetMouseButton (button : int) : boolean

Description

Returns whether the given mouse button is held down.

button values are 0 for left button, 1 for right button, 2 for the middle button.

JavaScript
// Detects clicks from the mouse and prints a message
// depending on the click detected.

function Update() {
if(Input.GetMouseButton(0))
Debug.Log("Pressed left click.");
if(Input.GetMouseButton(1))
Debug.Log("Pressed right click.");
if(Input.GetMouseButton(2))
Debug.Log("Pressed middle click.");
}