Add files via upload

js/index.js

@@ -0,0 +1,21 @@
+let slideIndex = 1;  
+showSlides(slideIndex);  
+
+function changeSlides(n) {  
+    showSlides(slideIndex += n);  
+}  
+
+function showSlides(n) {  
+    let i;  
+    let slides = document.getElementsByClassName("slides")[0];  
+    let slidesLength = slides.getElementsByTagName("img").length;  
+      
+    if (n > slidesLength) {slideIndex = 1}      
+    if (n < 1) {slideIndex = slidesLength}  
+      
+    for (i = 0; i < slidesLength; i++) {  
+        slides.getElementsByTagName("img")[i].style.display = "none";    
+    }  
+      
+    slides.getElementsByTagName("img")[slideIndex-1].style.display = "block";    
+}