i want to use the following sketch as a background of a webpage, so i have exported it with processing 2.0 to run in .js and it works fine, except that i want it to be fullscreen and i don't know how to achieve that. i already tried by putting '100%' in width and height in the style but it doesn't work and i don't know how to program javascript, any suggestions? 

2. ArrayList <John> johnsons;
3. int num = 300;
4. 
   
5. void setup() {
6.   size(800, 600);
7.   smooth();
8.   johnsons = new ArrayList<John>();
9.   for (int i = 0; i < num; i++) {
10.     johnsons.add( new John() );
11.   }
12. }
13. 
    
14. void draw() {
15.   background(255);
16.   /*for (int i = 0; i < num; i++) {
17.    johnsons.get(i).move();
18.    johnsons.get(i).draw();
19.    } è come scrivere il paragrafo seguente*/
20.   for (John j : johnsons) {
21.     j.move();
22.     j.draw();
23.     j.checkMouse();
24.   }
25. }
26. 
    
27. void mousePressed() {
28.   for (int i = 0; i < num; i++) {
29.     johnsons.get(i).mouse();
30.   }
31. }
34. class John {
35.   float px, py;
36.   float dx, dy;
37.   float damp;
38.   color sc;
39. 
    
40.   John() {
41.     px = width / 2;
42.     py = height/2;
43.     dx = random(width);
44.     dy = random(height);
45.     damp = random(0.01, 0.04);
46.     sc = color(random(100, 255), 0, random(15, 25));
47.   }
48. 
    
49.   void move() {
50.     dx += random(-5, +5);
51.     dy += random(-5, +5);
52.     px += (dx - px) * damp;
53.     py += (dy - py) * damp;
54.   }
55. 
    
56.   void draw() {
57. 
    
58.     fill(sc, 30);
59.     noStroke();
60.     ellipse(px, py, 20, 20);
61.     fill(100);
62.     noStroke();
63.     ellipse(px, py, 5, 5);
64.   }
65. 
    
66.   void mouse() {
67.     dx = mouseX;
68.     dy = mouseY;
69.   }
70. 
    
71.   void checkMouse() {
72.     float mouseRadius = 20;
73.     float d = dist(mouseX, mouseY, px, py);
74.     if (d<mouseRadius && d > 0.0001) {
75.       dx += (px-mouseX) / d*mouseRadius;
76.       dy += (py-mouseY) / d*mouseRadius;
77.     }
78.   }
79. }
80.