make slideshow width and autorotation configurable

static/js/snap-gallery.js

@@ -7,6 +7,9 @@ var imageIndex  = {}
 // Open the Lightbox
 function openLightbox(id) {
   document.getElementById(lightbox_baseid + id).style.display = "block";
+
+  // Kill automatic slideshow when lightbox opened
+  clearInterval(autoSlideshow);
 }
 
 // Close the Lightbox
@@ -25,11 +28,13 @@ function moveLightboxItem(id, n) {
 }
 
 // Next/previous controls for slideshow
-function moveSlideshowItem(id, n) {
+function moveSlideshowItem(id, n, mode) {
   showItem(slideshow_baseid, id, imageIndex[id] += n, ".snap-image");
 
-  // Kill automatic slideshow once the slideshow has been moved
-  clearInterval(autoSlideshow);
+  // Kill automatic slideshow once the slideshow has been moved manually
+  if (mode !== "auto") {
+    clearInterval(autoSlideshow);
+  }
 }
 
 // In the slideshow or lightbox, make a specific image visible, make others hidden