Traffic light with button problem, help guys :)

if hold on pressing button traffic lights change ,
i wan cancel please, help?

code: [select]


const int greenpin = 4; // green led pin
const int yellowpin = 3;
const int redpin = 2;
const int buttonpin = 12;
int ali = 0;

void setup() {
 
for (int = 2; <= 4; i++) { // setting outputs
  pinmode(i, output);
}

pinmode(buttonpin, output);

}

void turnlightsoff() { // function
  digitalwrite(redpin, low);
  digitalwrite(yellowpin, low);
  digitalwrite(greenpin, low);
}



void loop() {

boolean  buttonstatus = digitalread(buttonpin);

  if (buttonstatus == high) {
    delay(1000);
 if (buttonstatus == high) {
    ali = ali + 1;
    if (ali > 2) {
 ali = 0;
}
  }
 }

if (ali == 0) {
  digitalwrite(greenpin, low);
  digitalwrite(redpin, high); delay(500);
 
  }
  else if (ali == 1) {
  digitalwrite(redpin, low);
  digitalwrite(yellowpin, high);delay(500);

  }
  else if (ali == 2) {
   
  digitalwrite(yellowpin, low);
  digitalwrite(greenpin, high);delay(500);
 
  }
 
  else
  {
    turnlightsoff();
  }
  }
 
 
 


well starters:

code: [select]

pinmode(buttonpin, output);

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