text: var slideIndex = [1];
  /* Class the members of each slideshow group with different CSS classes */
  var slideId = ["mySlides4"] 
  showSlides(1, 0);
  
  
  function plusSlides(n,no) {
    showSlides(slideIndex[no] += n, no);
  }
  
  function showSlides(n, no) {
    var i;
    var x = document.getElementsByClassName(slideId[no]);
    if (n > x.length) {slideIndex[no] = 1} 
    if (n < 1) {slideIndex[no] = x.length}
    for (i = 0; i < x.length; i++) {
      x[i].style.display = "none"; 
    }
    x[slideIndex[no]-1].style.display = "block";
  }