Processing help

Hi guys I recently got into this and need some help developing a certain app. The instructions of the app is to make the color of the app change. I am using Processing now and the instructions is to use the IF/ELSE. I am familiar with PHP but this is a bit new to me. I have to use mouseX and mouseY. here is the code I have. I want it that when I click over the left top square it changed both black squares white.

Code:

---

int x;
int y;
void setup() { 
    loop();
  size(200, 200);
  background(255,0,0);       
  fill(0);
  rect(0, 0, 100, 100);
  fill(0);
  rect(100, 100, 100, 100);
}
if (mouseX - (0, 0, 100, 100)) {
  fill(255);
  rect(0, 0, 100, 100);
  fill(255);
  rect(100, 100, 100, 100);
}

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Can you clear-up bit more your requirement? Do you want to fill colors in a specific area?

eranga, don't waste your time as this was cross-posted in the sun forum with extensive discussion there.

Oops, better to register on Sun forums as well. I really hate this, I'm looking to help anytime, but not in this way.