servo motor control with msTimer2 libraries

When you click the mouse features a Ah back of servo motor and want to stop.

And servo motor, stored in a variable of each different servo motor in the assignment.

The problem is that the servo motors to turning to msTimer2 signal stop is about known.
What’s the problem? Help me

#include <MsTimer2.h>
#include <Servo.h> 

Servo servo1, servo2;

int prePos = 0;


void moveServo() {
  static int pos = 0;
  static int spd = 1;
  pos = pos + spd;
  if(pos > 180){  
    spd *= -1;  
  }
  if(pos < 0  ){  
    spd *= -1;  
  }

  servo1.write(pos);
  prePos = pos;
}

void setup() {
  Serial.begin(9600);

  pinMode(10, OUTPUT);
  servo1.attach(9);

  MsTimer2::set(15, moveServo); // 15ms period

}

void loop() {

  if( serialEvent() == 1){
    MsTimer2::stop();
    digitalWrite(10, LOW);
  }
  if(serialEvent() == 0){

    MsTimer2::start();
    digitalWrite(10, HIGH);

  }
  debugging(serialEvent());
  delay(10);

}


boolean serialEvent(){
  if(Serial.available() > 0){
    int val = Serial.read();

    if( val == 1){
      return 1;
    }
  }  
  else {
    return 0;
  }   
}

void debugging(int val){
  Serial.print("val: ");
  Serial.print(val, DEC);
  Serial.println();
}