first work into renewed gallery

static/js/snap-gallery.js

@@ -0,0 +1,40 @@
+// Open the Modal
+function openModal() {
+  document.getElementById("myModal").style.display = "block";
+}
+
+// Close the Modal
+function closeModal() {
+  document.getElementById("myModal").style.display = "none";
+}
+
+var slideIndex = 1;
+showSlides(slideIndex);
+
+// Next/previous controls
+function plusSlides(n) {
+  showSlides(slideIndex += n);
+}
+
+// Thumbnail image controls
+function currentSlide(n) {
+  showSlides(slideIndex = n);
+}
+
+function showSlides(n) {
+  var i;
+  var slides = document.getElementsByClassName("mySlides");
+  var dots = document.getElementsByClassName("demo");
+  var captionText = document.getElementById("caption");
+  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(" img-active", "");
+  }
+  slides[slideIndex - 1].style.display = "block";
+  dots[slideIndex - 1].className += " img-active";
+  captionText.innerHTML = dots[slideIndex - 1].alt;
+}