var slideIndex = 3;
showDivs(slideIndex);

function plusDivs(n)
{
	showDivs(slideIndex += n);
}

function showDivs(n)
{
	var i;
  var slides = document.getElementsByClassName("slides");
  var slides_desc = document.getElementsByClassName("slides_desc");
  var slides_pos = document.getElementsByClassName("slides_pos_pointer");
  
  if(n > slides.length) {slideIndex = 1}
  if(n < 1) {slideIndex = slides.length}
  
  for(i = 0; i < slides.length; i++)
  {
   	slides[i].style.display = "none";
    slides_desc[i].style.display = "none";
    slides_pos[i].innerHTML = '<i class="icon icon-circle-empty"></i>';
  }
  
  slides[slideIndex-1].style.display = "block";
  slides_desc[slideIndex-1].style.display = "block";
  slides_pos[slideIndex-1].innerHTML = '<i class="icon icon-circle"></i>';
}