+<script>
+var slideIndex = 1;
+showDivs(slideIndex);
+
+function plusDivs(n) {
+ showDivs(slideIndex += n);
+}
+
+function showDivs(n) {
+ var i;
+ var x = document.getElementsByClassName("model");
+ if (n > x.length) {slideIndex = 1}
+ if (n < 1) {slideIndex = x.length}
+ for (i = 0; i < x.length; i++) {
+ x[i].style.display = "none";
+ }
+ x[slideIndex-1].style.display = "block";
+}
+</script>
+
+