Any help please? Want the ellipses to change from blue to red when the mouse is over the slider/knob which moves them...have a look at the sketch to see what i mean..any help much appreciated!

cheers,

josh

2. 
   
3. import controlP5.*;
4. int  pos1Y;
5. int  pos1X;
6. int slider = pos1Y;
7. int dial = pos1X;
8. int slider1 = pos1Y;
9. int dial1 = pos1X;
10. int slider2 = pos1Y;
11. int dial2 = pos1X;
12. ControlP5 cp5;
13. 
    
14. void setup() {
15.   background (255);
16.   smooth();
17.   size(700, 400);
18.   cp5 = new ControlP5(this); 
19.   ControlWindow cw = cp5.addControlWindow("controlP5window", 208, 396, 800, 250, 30);
20. 
    
21.   Slider s = cp5.addSlider("slider", -150, 179.8, 40, 40, 129, 25, 120);
22.   Slider s1 = cp5.addSlider("slider1", -150, 179.8, 40, 140, 129, 25, 120);
23.   Slider s2 = cp5.addSlider("slider2", -150, 179.8, 40, 240, 129, 25, 120);
24.   s.setWindow(cw);
25.   s1.setWindow(cw);
26.   s2.setWindow(cw);
27.   s.setLabelVisible(false);
28.   s1.setLabelVisible(false);
29.   s2.setLabelVisible(false);
30.   Knob k = cp5.addKnob("dial", 0, width, 40, 90, 30);
31.   Knob k1 = cp5.addKnob("dial1", 0, width, 140, 90, 30);
32.   Knob k2 = cp5.addKnob("dial2", 0, width, 240, 90, 30);
33.   k.setWindow(cw);
34.   k1.setWindow(cw);
35.   k2.setWindow(cw);
36.   cw.setBackground(color(40));
37. }
38. 
    
39. void draw() {
40.   background(175);
41.   smooth();
42.   stroke (160); 
43.   strokeWeight (0.2);
44. 
    
45.   line(dial, 0, dial, height);
46.   line(0, height-200-slider, width, height-200-slider);
47.   line(dial1, 0, dial1, height);
48.   line(0, height-200-slider1, width, height-200-slider1);
49.   line(dial2, 0, dial2, height);
50.   line(0, height-200-slider2, width, height-200-slider2);
51. 
    
52.   fill (0, 0, 255, 105);
53.   ellipse (dial, height-200-slider, 25, 25);
54.   ellipse (dial1, height-200-slider1, 25, 25);
55.   ellipse (dial2, height-200-slider2, 25, 25);
56. }
57.