function eventFire(element, eventType){
  if (element.fireEvent) {
    element.fireEvent('on' + eventType);
  }
  else {
    var eventObject = document.createEvent('Events');
    eventObject.initEvent(eventType, true, false);
    element.dispatchEvent(eventObject);
  }
}

var elements = document.getElementsByClassName('opencloseimg');

function clickElement() {
  eventFire(elements[i], 'click');
  i++;
}

var i = 0;

clickElement();

setInterval(function() {
  clickElement();
}, 1000);