Activate/Deactivate Image Effect on "MouseDown"

Code (csharp):

1.  public var myCamera : Camera;
2.  private var myEffect : PP_Negative;
3.  
4.     function Start ()      
5.  
6.         {
7.  
8.             myEffect = GetComponent(PP_Negative);
9.      
10.         }
11.  
12.  
13.         function Update ()
14.  
15.         {
16.  
17.  
18.             if(Input.GetMouseButtonDown(0))
19.  
20.             {
21.  
22.              myEffect.enabled = !myEffect.enabled;
23.  
24.             }
25.  
26.         }

I jsut need to know how id go about plugging in the "public var myCamera" into the rest so i can use this on a gui button instead of a keypress method i had previously.

I already changed the "if(Input.GetKeyDown(E))" to "if(Input.GetMouseButtonDown(0))", now i just need to know where to put the var Camera.

Thank you in advance!

 

public var myCamera : Camera;
//private var myEffect : PP_Negative;

function Start ()

{

//myEffect = GetComponent(PP_Negative);

}





function OnGUI () {
if (GUI.Button (Rect (10,10,150,100), "I am a button")){
myCamera.GetComponent(PP_Negative).enabled = false;
print ("You clicked the button!");
}
}