item.js

var slideIndex=1;showSlides(slideIndex);function plusSlides(n){showSlides(slideIndex+=n)}
function currentSlide(n){showSlides(slideIndex=n)}
function showSlides(n){var i;var slides=document.getElementsByClassName("mySlides");var dots=document.getElementsByClassName("demo");if(n>slides.length){slideIndex=1}
if(n<1){slideIndex=slides.length}
for(i=0;i<slides.length;i++){slides[i].style.display="none"}
for(i=0;i<dots.length;i++){dots[i].className=dots[i].className.replace(" active","")}
slides[slideIndex-1].style.display="block";dots[slideIndex-1].className+=" active"}