Hello everybody !
I'm sorry for my bad english, I'm french and I study in Spain !!!
My problem I think it's very simple but it's necessary some helping !!
I have maked a sketch arduino for an instaltion interactive with a PIR sensor a sculpture and a video with sound in a computer. My arduino it's good the sensor fill good !
This is my sketch arduino :
* //////////////////////////////////////////////////
* //making sense of the Parallax PIR sensor's output
* //////////////////////////////////////////////////
*
* Switches a LED according to the state of the sensors output pin.
* Determines the beginning and end of continuous motion sequences.
*
* @author: Kristian Gohlke / krigoo (_) gmail (_) com /
*
* kr1 (cleft) 2006
* released under a creative commons "Attribution-NonCommercial-ShareAlike 2.0" license
*
*
*
* The Parallax PIR Sensor is an easy to use digital infrared motion sensor module.
*
*
* The sensor?s output pin goes to HIGH if motion is present.
* However, even if motion is present it goes to LOW from time to time,
* which might give the impression no motion is present.
* This program deals with this issue by ignoring LOW-phases shorter than a given time,
* assuming continuous motion is present during these phases.
*  
*/

/////////////////////////////
//VARS
//the time we give the sensor to calibrate (10-60 secs according to the datasheet)
int calibrationTime = 30;        

//the time when the sensor outputs a low impulse
long unsigned int lowIn;        

//the amount of milliseconds the sensor has to be low
//before we assume all motion has stopped
long unsigned int pause = 5000;  

boolean lockLow = true;
boolean takeLowTime;  

int pirPin = 3;    //the digital pin connected to the PIR sensor's output
int ledPin = 13;


/////////////////////////////
//SETUP
void setup(){
 Serial.begin(9600);
 pinMode(pirPin, INPUT);
 pinMode(ledPin, OUTPUT);
 digitalWrite(pirPin, LOW);

 //give the sensor some time to calibrate
 Serial.print("calibrating sensor ");
   for(int i = 0; i < calibrationTime; i++){
     Serial.print(".");
     delay(1000);
     }
   Serial.println(" done");
   Serial.println("SENSOR ACTIVE");
   delay(50);
 }

////////////////////////////
//LOOP
void loop(){

    if(digitalRead(pirPin) == HIGH){
      digitalWrite(ledPin, HIGH);   //the led visualizes the sensors output pin state
      if(lockLow){  
        //makes sure we wait for a transition to LOW before any further output is made:
        lockLow = false;            
        Serial.println("---");
        Serial.print("motion detected at ");
        Serial.print(millis()/1000);
        Serial.println(" sec");
        delay(50);
        }        
        takeLowTime = true;
      }

    if(digitalRead(pirPin) == LOW){      
      digitalWrite(ledPin, LOW);  //the led visualizes the sensors output pin state

      if(takeLowTime){
       lowIn = millis();          //save the time of the transition from high to LOW
       takeLowTime = false;       //make sure this is only done at the start of a LOW phase
       }
      //if the sensor is low for more than the given pause,
      //we assume that no more motion is going to happen
      if(!lockLow && millis() - lowIn > pause){  
          //makes sure this block of code is only executed again after
          //a new motion sequence has been detected
          lockLow = true;                        
          Serial.print("motion ended at ");      //output
          Serial.print((millis() - pause)/1000);
          Serial.println(" sec");
          delay(50);
          }
      }
 }


And my processing sketch with MousePressed  :

import processing.video.*;
Movie myMovie;
PImage pfc;

void setup() {
 size(1680, 1050,P2D);
 pfc = loadImage("photofc.jpg");
 
 myMovie = new Movie(this, "Pou.mov");
 myMovie.loop();
 background(0);
}

void draw()
{
  if  (mousePressed == true) {
    loadImage("photofc.jpg");
    image(pfc,0,0);
   
 
  } else {
    background(0);
    image(myMovie,480,237);
   
  }

}

void mousePressed() {
 myMovie.pause();
}

void mouseReleased() {
 myMovie.loop();
}

 BUT now I woold like replace the "Mouse" by my PIR sensor and I don't now how make that  
PLEASE if someone could helpme it's make me CRAZY !!!
Thank's