Camera Lock

I'm trying to stop all camera movement when a GUI comes on, and then resume movement once the GUI goes off. Any tips? I'm writing in Javascript and my code is below.

 var information: String;
 
 private var guiOn = false;
 
 private var rect: Rect;
 
 
 
 
 function OnMouseDown () {
     guiOn = true;
     rect = Rect(Screen.width/2-120,Screen.height/2-100,300,300);
 
 }
 
 
 
 function OnGUI () {
 
     if (guiOn){
 
         GUI.Label(rect, information);
 
         if (GUI.Button(Rect(Screen.width/2-0,Screen.height/2-50,75,50), "False")) {
                 guiOn = false;
         }
         if (GUI.Button(Rect(Screen.width/2-100,Screen.height/2-50,75,50), "True")) {
             animation.Play ("dooropen1");
             guiOn = false;
         }
     }
 
 }