function RollOver(id, img, chip)
{
  if(document.getElementById(id)) document.getElementById(id).src = 'img/' + img;
  else alert('Ýëåìåíò ñ id='+ id +' íàéäåí!');

  /* Ñìåíà êàðòèíêè ÷èïà */
  if(chip) document.getElementById('img-chip').src = 'img/chip'+ chip +'.png';
}