motion detection (or sound detection) question

Hi,

I'm new in Processing.
In this project I would like to make the myMovie2 ("direita.mov") appear only when there is movement (or sound).

I only put if (mousePressed) {
to check if the code was correct.

What should I do?
I also can't find why my movie is really slow...

Thank you very much for any help!

1. import processing.video.*;
2. Capture cam;
3. Movie myMovie, myMovie2;
4. void setup() {
5.   size(1440, 576);
6.  
7.   myMovie = new Movie(this, "normal.mov");
8.   myMovie2 = new Movie(this, "direita.mov");
9.   myMovie.speed(100.0);
10.   myMovie.loop();
11.   myMovie2.loop();
12.   String[] cameras = Capture.list();
13.  
14.   if (cameras.length == 0) {
15.     println("There are no cameras available for capture.");
16.     exit();
17.   } else {
18.     println("Available cameras:");
19.     for (int i = 0; i < cameras.length; i++) {
20.       println(cameras[i]);
21.     }
22.    
23.     cam = new Capture(this, cameras[0]);
24.     cam.start(); 
25.   }     
26. }
27. void draw() {
28.   if (myMovie.available()) {
29.     myMovie.read();
30.     image(myMovie, 0, 0, 720, 576);
31.   }
32.  
33.   if (mousePressed) {  // what should I put here?
34.     myMovie2.read();
35.     image(myMovie2, 0, 0, 720, 576);
36.   }
37.   if (cam.available() == true)
38.     cam.read();
39.    
40.   image(cam, width/2, 0, 720, 576);
41. }