function charge(id, calque) {
  if (calque.length != 0) {
	for (i=0; i<calque.length; i++) {
      document.getElementById(calque[i]).style.display='none';
	}
  }
  calque = new Array(id.length);
  for (i=0; i<id.length; i++) {
    calque[i] = 'h'+id[i];
    document.getElementById(calque[i]).style.display='block';
  }
  return calque;
}