CrossFade between multiple cameras

I am trying to adjust CrossFadePro.js into a version for multiple cameras but am not sure if it possible. So far I have made it like this (using ScreenWipes.js as well of course) ..It looks like it is almost working Any suggestions on how i can make it work?

 var camera1 : Camera;
 var camera2 : Camera;
 var camera3 : Camera;
 var camswitch1 : boolean;
 var camswitch2 : boolean;
 var aaa: float;
 var customButton : GUIStyle;
 var fadeTime = 2.0;
 private var inProgress = false;
 private var swap = false;
 
 function OnGUI() {
   if(GUI.Button(Rect(Screen.width/aaa-Screen.height/22,Screen.height/1.3,Screen.height/20,Screen.height/20),"",customButton))
     choose();
     }
 
 function choose()
 {
      if((camswitch1==true)&&(camswitch2==true))
         {
       
         fade1();
         camswitch2=false;
         }
         else if ((camswitch1==true)&&(camswitch2==false))
         {
       
         fade2();
         camswitch2=false;    
         }
         else  if ((camswitch1==false)&&(camswitch2==false))    
         {
         
         fade3();
         camswitch1=true;
         camswitch2=true;
         }
         
  }
 
 
 function fade1 () {
     if (inProgress) return;
     inProgress = true;
    
     swap = !swap;
     yield ScreenWipe.use.CrossFade (swap? camera1 : camera2, swap? camera2 : camera1, fadeTime);
    
     inProgress = false;
 }
  function fade2 () {
     if (inProgress) return;
     inProgress = true;
    
     swap = !swap;
     yield ScreenWipe.use.CrossFade (swap? camera2 : camera3, swap? camera3 : camera2, fadeTime);
    
     inProgress = false;
 }
  function fade3 () {
     if (inProgress) return;
     inProgress = true;
    
     swap = !swap;
     yield ScreenWipe.use.CrossFade (swap? camera3 : camera1, swap? camera1 : camera3, fadeTime);
    
     inProgress = false;
 }