diff --git a/code/model/Blog.php b/code/model/Blog.php
index d3c7e9c..b4f2c8c 100644
--- a/code/model/Blog.php
+++ b/code/model/Blog.php
@@ -80,8 +80,7 @@ class Blog extends Page implements PermissionProvider {
 
 	public function getCMSFields() {
 		Requirements::css(BLOGGER_DIR . '/css/cms.css');
-		Requirements::javascript(BLOGGER_DIR . '/js/expandable-help-text.js');
-		Requirements::javascript(BLOGGER_DIR . '/js/merge-action.js');
+		Requirements::javascript(BLOGGER_DIR . '/js/cms.js');
 
 		$self =& $this;
 
diff --git a/code/model/BlogPost.php b/code/model/BlogPost.php
index 7f05cbb..95634c8 100644
--- a/code/model/BlogPost.php
+++ b/code/model/BlogPost.php
@@ -108,6 +108,7 @@ class BlogPost extends Page {
 
 	public function getCMSFields() {
 		Requirements::css(BLOGGER_DIR . '/css/cms.css');
+		Requirements::javascript(BLOGGER_DIR . '/js/cms.js');
 
 		$self =& $this;
 		$this->beforeUpdateCMSFields(function($fields) use ($self) {
diff --git a/js/cms.js b/js/cms.js
new file mode 100644
index 0000000..15bae53
--- /dev/null
+++ b/js/cms.js
@@ -0,0 +1,118 @@
+(function ($) {
+
+	$.entwine('ss', function ($) {
+
+		/**
+		 * Register expandable help text functions with fields.
+		 */
+		$('.toggle-description').entwine({
+			'onadd': function () {
+				var $this = $(this);
+
+				/**
+				 * Prevent multiple events being added.
+				 */
+				if ($this.hasClass('toggle-description-enabled')) {
+					return;
+				}
+
+				$this.addClass('toggle-description-enabled');
+
+				/**
+				 * Toggle next description when button is clicked.
+				 */
+				var shown = false;
+
+				$this.on('click', function() {
+					$this.parent().next('.description')[shown ? 'hide' : 'show']();
+
+					$this.toggleClass('toggle-description-shown');
+
+					shown = !shown;
+				});
+
+				/**
+				 * Hide next description by default.
+				 */
+				$this.parent().next('.description').hide();
+
+				/**
+				 * Add classes to correct inherited layout issues in a small context.
+				 */
+				$this.parent().addClass('toggle-description-correct-right');
+				$this.parent().prev('.middleColumn').addClass('toggle-description-correct-middle');
+				$this.parent().next('.description').addClass('toggle-description-correct-description');
+			}
+		});
+		
+		/**
+		 * Custom merge actions for tags and categories
+		 */
+		$('.MergeAction').entwine({
+			'onadd': function() {
+				var $this = $(this);
+
+				$this.on('click', 'select', function() {
+					return false;
+				});
+
+				$this.children('button').each(function(i, button) {
+					var $button = $(button);
+					var $select = $button.prev('select');
+
+					$button.before('<input type="hidden" name="' + $button.attr('data-target') + '" value="' + $select.val() + '" />');
+				});
+
+				$this.on('change', 'select', function(e) {
+					var $target = $(e.target);
+
+					$target.next('input').val($target.val());
+				});
+
+				$this.children('button, select').hide();
+
+				$this.on('click', '.MergeActionReveal', function(e) {
+					var $target = $(e.target);
+
+					$target.parent().children('button, select').show();
+					$target.hide();
+
+					return false;
+				});
+			}
+		});
+		
+		/**
+		 * Customise the cms-panel behaviour for blog sidebar
+		 * 
+		 * see LeftAndMain.Panel.js for base behaviour
+		 */
+		$('.blog-admin-sidebar.cms-panel').entwine({
+			minInnerWidth: 620,
+			onadd: function() {
+				this._super();
+				this.updateLayout();
+				
+				// If this panel is open and the left hand column is smaller than the minimum, contract it instead
+				if(!this.hasClass('collapsed') && ($(".blog-admin-outer").width() < this.getminInnerWidth())) {
+					this.collapsePanel();
+				}
+			},
+			togglePanel: function(bool, silent) {
+				this._super(bool, silent);
+				this.updateLayout();
+			},
+			/**
+			 * Adjust minimum width of content to account for extra panel
+			 * 
+			 * @returns {undefined}
+			 */
+			updateLayout: function() {
+				$('.cms-container').updateLayoutOptions({
+					minContentWidth: 820 + this.width()
+				});
+			}
+		});
+
+	});
+})(jQuery);
diff --git a/js/expandable-help-text.js b/js/expandable-help-text.js
deleted file mode 100644
index e64a3fe..0000000
--- a/js/expandable-help-text.js
+++ /dev/null
@@ -1,49 +0,0 @@
-/**
- * Register expandable help text functions with fields.
- */
-(function ($) {
-
-	$.entwine('ss', function ($) {
-
-		$('.toggle-description').entwine({
-			'onadd': function () {
-				var $this = $(this);
-
-				/**
-				 * Prevent multiple events being added.
-				 */
-				if ($this.hasClass('toggle-description-enabled')) {
-					return;
-				}
-
-				$this.addClass('toggle-description-enabled');
-
-				/**
-				 * Toggle next description when button is clicked.
-				 */
-				var shown = false;
-
-				$this.on('click', function() {
-					$this.parent().next('.description')[shown ? 'hide' : 'show']();
-
-					$this.toggleClass('toggle-description-shown');
-
-					shown = !shown;
-				});
-
-				/**
-				 * Hide next description by default.
-				 */
-				$this.parent().next('.description').hide();
-
-				/**
-				 * Add classes to correct inherited layout issues in a small context.
-				 */
-				$this.parent().addClass('toggle-description-correct-right');
-				$this.parent().prev('.middleColumn').addClass('toggle-description-correct-middle');
-				$this.parent().next('.description').addClass('toggle-description-correct-description');
-			}
-		});
-
-	});
-})(jQuery);
diff --git a/js/merge-action.js b/js/merge-action.js
deleted file mode 100644
index 74530b8..0000000
--- a/js/merge-action.js
+++ /dev/null
@@ -1,44 +0,0 @@
-/**
- * Register expandable help text functions with fields.
- */
-(function ($) {
-
-	$.entwine('ss', function ($) {
-
-		$('.MergeAction').entwine({
-			'onadd': function() {
-				var $this = $(this);
-
-				$this.on('click', 'select', function() {
-					return false;
-				});
-
-				$this.children('button').each(function(i, button) {
-					var $button = $(button);
-					var $select = $button.prev('select');
-
-					$button.before('<input type="hidden" name="' + $button.attr('data-target') + '" value="' + $select.val() + '" />');
-				});
-
-				$this.on('change', 'select', function(e) {
-					var $target = $(e.target);
-
-					$target.next('input').val($target.val());
-				});
-
-				$this.children('button, select').hide();
-
-				$this.on('click', '.MergeActionReveal', function(e) {
-					var $target = $(e.target);
-
-					$target.parent().children('button, select').show();
-					$target.hide();
-
-					return false;
-				});
-			}
-		})
-
-	});
-
-}(jQuery));