diff --git a/ui/bookmarks.js b/ui/bookmarks.js
index c12ef810..8abbe88f 100755
--- a/ui/bookmarks.js
+++ b/ui/bookmarks.js
@@ -162,6 +162,11 @@ function setupBookmarks(viewer){
 			BOOKMARKS = fastSortGIDsByOrder(BOOKMARKS)
 			bookmarksUpdated()
 		})
+		.on('horizontalShiftedImage', function(evt, gid, direction){
+			if(shiftGIDToOrderInList(gid, direction, BOOKMARKS)){
+				bookmarksUpdated()
+			}
+		})
 }
 SETUP_BINDINGS.push(setupBookmarks)
 
diff --git a/ui/layout.css b/ui/layout.css
index 3ffed43c..75a7bca4 100755
--- a/ui/layout.css
+++ b/ui/layout.css
@@ -1230,11 +1230,11 @@ button:hover {
 }
 .small.viewer:not(.single-image-mode) .mark:after,
 .small.viewer:not(.single-image-mode) .marked.image:after {
-  -webkit-transform: rotate(0deg) scaleY(1.8) scaleX(1.8);
-  -moz-transform: rotate(0deg) scaleY(1.8) scaleX(1.8);
-  -o-transform: rotate(0deg) scaleY(1.8) scaleX(1.8);
-  -ms-transform: rotate(0deg) scaleY(1.8) scaleX(1.8);
-  transform: rotate(0deg) scaleY(1.8) scaleX(1.8);
+  -webkit-transform: rotate(0deg) scaleY(1.5) scaleX(1.5);
+  -moz-transform: rotate(0deg) scaleY(1.5) scaleX(1.5);
+  -o-transform: rotate(0deg) scaleY(1.5) scaleX(1.5);
+  -ms-transform: rotate(0deg) scaleY(1.5) scaleX(1.5);
+  transform: rotate(0deg) scaleY(1.5) scaleX(1.5);
 }
 /********************************************************* Overlay ***/
 .overlay-block {
diff --git a/ui/layout.less b/ui/layout.less
index b2f35d18..215a9104 100755
--- a/ui/layout.less
+++ b/ui/layout.less
@@ -1283,7 +1283,7 @@ button:hover {
 
 .small.viewer:not(.single-image-mode) .mark:after,
 .small.viewer:not(.single-image-mode) .marked.image:after {
-	.scale(1.8);
+	.scale(1.5);
 }
 
 
diff --git a/ui/lib/jli.js b/ui/lib/jli.js
index b015801a..6b3500f3 100755
--- a/ui/lib/jli.js
+++ b/ui/lib/jli.js
@@ -728,6 +728,12 @@ function makeDeferredsQ(first){
 
 /**************************************************** JS utilities ***/
 
+// return 1, -1, or 0 depending on sign of x
+function sign(x){
+	return (x > 0) - (x < 0)
+}
+
+
 String.prototype.capitalize = function(){
 	return this[0].toUpperCase() + this.slice(1)
 }
diff --git a/ui/marks.js b/ui/marks.js
index 324a963b..4b2ec9e0 100755
--- a/ui/marks.js
+++ b/ui/marks.js
@@ -235,6 +235,30 @@ function makeMarkUpdater(img_class, mark_class, test){
 }
 
 
+// NOTE: this supports only shifts by one position...
+function shiftGIDToOrderInList(gid, direction, list){
+	var gid_o = DATA.order.indexOf(gid)
+	var gid_m = list.indexOf(gid)
+
+	var a_m = gid_m + (direction == 'next' ? 1 : -1)
+	if(a_m < 0 || a_m >= list.length){
+		return false
+	}
+	var a_gid = list[a_m]
+	var a_o = DATA.order.indexOf(a_gid)
+
+	// if relative positions of cur and adjacent gids in list 
+	// are different to that in DATA.order, then replace the gids
+	// in list...
+	if(sign(a_m - gid_m) != sign(a_o - gid_o)){
+		list[a_m] = gid
+		list[gid_m] = a_gid
+		return true
+	}
+	return false
+}
+
+
 
 /**********************************************************************
 * 
@@ -742,6 +766,11 @@ function setupMarks(viewer){
 			MARKED = fastSortGIDsByOrder(MARKED)
 			marksUpdated()
 		})
+		.on('horizontalShiftedImage', function(evt, gid, direction){
+			if(shiftGIDToOrderInList(gid, direction, MARKED)){
+				marksUpdated()
+			}
+		})
 		.on('baseURLChanged', function(){
 			invalidateMarksCache()
 		})
diff --git a/ui/tags.js b/ui/tags.js
index e09ed5c0..5b08ff8c 100755
--- a/ui/tags.js
+++ b/ui/tags.js
@@ -537,6 +537,17 @@ function setupUnsortedTagHandler(viewer){
 			}
 			tagsUpdated()
 		})
+		.on('horizontalShiftedImage', function(evt, gid, direction){
+			var updated = false
+			for(var tag in TAGS){
+				if(TAGS[tag].indexOf(gid) >= 0){
+					updated = shiftGIDToOrderInList(gid, direction, TAGS[tag])
+				}
+			}
+			if(updated){
+				tagsUpdated()
+			}
+		})
 }
 SETUP_BINDINGS.push(setupUnsortedTagHandler)