function rotateEvent(btnEvent){
  
  var currentEvent = document.getElementById("currentEvent");
  var totalEvent = document.getElementById("totalEvent");
 
  var currentEventValue = parseInt(currentEvent.innerHTML);
  var totalEventValue = parseInt(totalEvent.innerHTML);
  
  if(btnEvent.id == "eventRotateLeft"){
	if(currentEventValue == 1){
		var previousEventDiv = document.getElementById("event"+(totalEventValue));
		previousEventDiv.style.display ="block";
		currentEvent.innerHTML = totalEventValue;
	}
	else{
		var previousEventDiv = document.getElementById("event"+(currentEventValue - 1));
		previousEventDiv.style.display ="block";
		currentEvent.innerHTML = currentEventValue - 1;
	}
  }
  else{
	if(currentEventValue == totalEventValue){
		var nextEventDiv = document.getElementById("event1");
		nextEventDiv.style.display ="block";
		currentEvent.innerHTML = 1;	
	}
	else{
		var nextEventDiv = document.getElementById("event"+(currentEventValue + 1));
		nextEventDiv.style.display ="block";
		currentEvent.innerHTML = currentEventValue + 1;	
	}
  }
  
  var currentEventDiv = document.getElementById("event"+currentEventValue);
  currentEventDiv.style.display ="none"; 
}