var knopka = document.getElementById ('push');
knopka.addEventListener('click',func1);
 
function func1() {
  var shadow = document.getElementById ('ts1');
  if (shadow.style.display !== 'none'){
  	shadow.style.display="none";
  }else{
  	shadow.style.display="block";
  }
  
};

setRate(rate) {
    if (rate == 20) {
      this._rate = rate;
    }
    return rate;
  }

setDays(days) {
    if (days == 10) {
      this._days = days;
    }
    return days;
  }