diff --git a/ui/bookmarks.js b/ui/bookmarks.js
index d566461a..f8ea6ea8 100755
--- a/ui/bookmarks.js
+++ b/ui/bookmarks.js
@@ -53,8 +53,8 @@ function getBookmarkedGIDBefore(gid){
 
 /*********************************************************************/
 
-function cropBookmarkedImages(cmp, keep_ribbons, no_cleanout_marks){
-	cropDataTo(BOOKMARKS.slice(), keep_ribbons, no_cleanout_marks)
+function cropBookmarkedImages(cmp, keep_ribbons, keep_unloaded_gids){
+	cropDataTo(BOOKMARKS.slice(), keep_ribbons, keep_unloaded_gids)
 
 	return DATA
 }
diff --git a/ui/compatibility.js b/ui/compatibility.js
index 7ab0ac31..c7c9f2c1 100755
--- a/ui/compatibility.js
+++ b/ui/compatibility.js
@@ -251,9 +251,7 @@ if(window.CEF_dumpJSON != null){
 							// add the preview to the image object...
 							img.preview[size+'px'] = './' + CACHE_DIR +'/'+ preview_path.split(CACHE_DIR).pop()
 							// mark image dirty...
-							if(IMAGES_UPDATED.indexOf(gid) < 0){
-								IMAGES_UPDATED.push(gid)
-							}
+							imageUpdated(gid)
 						}
 						//console.log('>>> Preview:', name, '('+size+'): Exists.')
 						deferred.notify(gid, size, 'exists')
@@ -324,9 +322,7 @@ if(window.CEF_dumpJSON != null){
 								}
 								img.preview[size+'px'] = './' + CACHE_DIR +'/'+ preview_path.split(CACHE_DIR).pop()
 								// mark image dirty...
-								if(IMAGES_UPDATED.indexOf(gid) < 0){
-									IMAGES_UPDATED.push(gid)
-								}
+								imageUpdated(gid)
 								// we are done...
 								deferred.resolve()
 							}
diff --git a/ui/data.js b/ui/data.js
index 9524e47f..096f5e2c 100755
--- a/ui/data.js
+++ b/ui/data.js
@@ -695,6 +695,16 @@ function orientationExif2ImageGrid(orientation){
 }
 
 
+// mark an image as updated...
+//
+function imageUpdated(gid){
+	gid = gid == null ? getImageGID(): gid
+	if(IMAGES_UPDATED.indexOf(gid) == -1){
+		IMAGES_UPDATED.push(gid)
+	}
+}
+
+
 
 /**********************************************************************
 * Constructors and general data manipulation
diff --git a/ui/files.js b/ui/files.js
index 901887bf..f85e7e37 100755
--- a/ui/files.js
+++ b/ui/files.js
@@ -753,9 +753,8 @@ function readImageOrientation(gid, no_update_loaded){
 			img.flipped = o.flipped
 
 			// mark image dirty...
-			if((o_o != o.orientation || o_f != o.flipped ) 
-					&& IMAGES_UPDATED.indexOf(gid) < 0){
-				IMAGES_UPDATED.push(gid)
+			if(o_o != o.orientation || o_f != o.flipped){
+				imageUpdated(gid)
 			}
 
 			// update image if loaded...
@@ -811,7 +810,7 @@ function readImagesDates(images){
 	return $.when.apply(null, $.map(images, function(_, gid){
 		return readImageDate(gid, images)
 			.done(function(){
-				IMAGES_UPDATED.push(gid)
+				imageUpdated(gid)
 			})
 	}))
 }
@@ -823,7 +822,7 @@ function readImagesDatesQ(images){
 	$.each(images, function(gid, img){
 		queue.enqueue(readImageDate, gid, images)
 			.always(function(){ 
-				IMAGES_UPDATED.push(gid)
+				imageUpdated(gid)
 				queue.notify(gid, 'done') 
 			})
 	})
@@ -844,7 +843,7 @@ function updateImageGID(gid, images, data){
 			// images...
 			images[gid] = images[key]
 			delete images[key]
-			IMAGES_UPDATED.push(gid)
+			imageUpdated(gid)
 
 			// data...
 			if(data != null){
diff --git a/ui/marks.js b/ui/marks.js
index b0861940..8f736762 100755
--- a/ui/marks.js
+++ b/ui/marks.js
@@ -144,12 +144,11 @@ var updateSelectedImageMark = makeMarkUpdater(
 // NOTE: MARKED may contain both gids that are not loaded and that do 
 // 		not exist, as there is no way to distinguish between the two 
 // 		situations the cleanup is optional...
-function cropMarkedImages(cmp, keep_ribbons, no_cleanout_marks){
+function cropMarkedImages(cmp, keep_ribbons, keep_unloaded_gids){
 	cmp = cmp == null ? imageOrderCmp : cmp
-	var cur = DATA.current
 	var marked = MARKED.slice().sort(cmp)
 
-	cropDataTo(marked, keep_ribbons, no_cleanout_marks)
+	cropDataTo(marked, keep_ribbons, keep_unloaded_gids)
 
 	return DATA
 }
diff --git a/ui/setup.js b/ui/setup.js
index 2304e28c..bc8dfea4 100755
--- a/ui/setup.js
+++ b/ui/setup.js
@@ -290,9 +290,7 @@ function setupDataBindings(viewer){
 				// change the image orientation status and add to 
 				// updated list...
 				IMAGES[gid].orientation = orientation
-				if(IMAGES_UPDATED.indexOf(gid) == -1){
-					IMAGES_UPDATED.push(gid)
-				}
+				imageUpdated(gid)
 			})
 		})
 		.on('flippingVertical flippingHorizontal', function(evt, image){
@@ -302,9 +300,7 @@ function setupDataBindings(viewer){
 				var flip = getImageFlipState(img)
 
 				IMAGES[gid].flipped = flip
-				if(IMAGES_UPDATED.indexOf(gid) == -1){
-					IMAGES_UPDATED.push(gid)
-				}
+				imageUpdated(gid)
 			})
 		})
 		.on('resetToOriginalImage', function(evt, image){
@@ -315,9 +311,7 @@ function setupDataBindings(viewer){
 				IMAGES[gid].flipped = null
 				IMAGES[gid].orientation = 0
 
-				if(IMAGES_UPDATED.indexOf(gid) == -1){
-					IMAGES_UPDATED.push(gid)
-				}
+				imageUpdated(gid)
 			})
 		})
 
diff --git a/ui/tags.js b/ui/tags.js
index 3efbe06f..3766a924 100755
--- a/ui/tags.js
+++ b/ui/tags.js
@@ -10,9 +10,7 @@
 // 		...
 // 	}
 //
-TAGS = {
-
-}
+var TAGS = {}
 
 
 
@@ -72,8 +70,8 @@ function addTag(tags, gid, tagset, images){
 			set = []
 			tagset[tag] = set
 		}
-		if(set.indexOf(tag) < 0){
-			set.push(tag)
+		if(set.indexOf(gid) < 0){
+			set.push(gid)
 			set.sort()
 		}
 
@@ -84,8 +82,7 @@ function addTag(tags, gid, tagset, images){
 
 	if(updated){
 		img.tags = img_tags
-		// XXX hardcoded and not customizable...
-		IMAGES_UPDATED.push(gid)
+		imageUpdated(gid)
 	}
 }
 
@@ -121,8 +118,7 @@ function removeTag(tags, gid, tagset, images){
 	}
 
 	if(updated){
-		// XXX hardcoded and not customizable...
-		IMAGES_UPDATED.push(gid)
+		imageUpdated(gid)
 	}
 }
 
@@ -203,6 +199,49 @@ function getRelatedTags(){
 }
 */
 
+/*********************************************************************/
+
+function tagMarked(tags){
+	MARKED.forEach(function(gid){
+		addTag(tags, gid)
+	})
+	return MARKED
+}
+function untagMarked(tags){
+	MARKED.forEach(function(gid){
+		removeTag(tags, gid)
+	})
+	return MARKED
+}
+
+
+function markTagged(tags){
+	MARKED = selectByTags(tags)
+	updateImages()
+	return MARKED
+}
+function unmarkTagged(tags){
+	var set = selectByTags(tags)
+	set.forEach(function(gid){
+		var i = MARKED.indexOf(gid)
+		if(i > -1){
+			MARKED.splice(i, 1)
+		}
+	})
+	updateImages()
+	return set
+}
+
+
+function cropTagged(tags, cmp, keep_ribbons, keep_unloaded_gids){
+	cmp = cmp == null ? imageOrderCmp : cmp
+	var set = selectByTags(tags).sort(cmp)
+
+	cropDataTo(set, keep_ribbons, keep_unloaded_gids)
+
+	return DATA
+}
+
 
 
 /**********************************************************************
diff --git a/ui/ui.js b/ui/ui.js
index fbcae805..61831153 100755
--- a/ui/ui.js
+++ b/ui/ui.js
@@ -1246,7 +1246,7 @@ function showImageInfo(){
 				} else {
 					data.comment = ncomment
 				}
-				IMAGES_UPDATED.push(gid)
+				imageUpdated(gid)
 			}
 
 			// tags...