diff --git a/src/jquery.multiselect.js b/src/jquery.multiselect.js
index c389bad..cf7a7b3 100644
--- a/src/jquery.multiselect.js
+++ b/src/jquery.multiselect.js
@@ -46,7 +46,7 @@
       noneSelectedText: 'Select options', // (str | null) The text to show in the button where nothing is selected.  Set to null to use the native select's placeholder text.
       selectedText: '# of # selected',    // (str) A "template" that indicates how to show the count of selections in the button.  The "#'s" are replaced by the selection count & option count.
       selectedList: 0,                    // (int) The actual list selections will be shown in the button when the count of selections is <= than this number.
-      selectedMax: null,                  // (int | function)  If selected count > selectedMax or if function returns 1, then message is displayed, and new selection is undone.
+      maxSelected: null,                  // (int | null)  If selected count > maxSelected, then message is displayed, and new selection is undone.
       show: null,                         // (array) An array containing menu opening effects.
       hide: null,                         // (array) An array containing menu closing effects.
       autoOpen: false,                    // (true | false) If true, then the menu will be opening immediately after initialization.
@@ -104,7 +104,7 @@
       var options = this.options;
       var classes = options.classes;
       var headerOn = options.header;
-      var checkAllText = options.checkAllText;
+      var checkAllText = options.maxSelected ? null : options.checkAllText;
       // Do an extend here to address icons missing from options.iconSet--missing icons default to those in defaultIcons.
       var iconSet = $.extend({}, defaultIcons, options.iconSet || {});
       var uncheckAllText = options.uncheckAllText;
@@ -119,10 +119,9 @@
       this.speed = $.fx.speeds._default;
       this._isOpen = false;
 
-      // create a unique namespace for events that the widget
-      // factory cannot unbind automatically. Use eventNamespace if on
-      // jQuery UI 1.9+, and otherwise fallback to a custom string.
-      this._namespaceID = this.eventNamespace || ('multiselect' + multiselectID);
+      // Create a unique namespace for events that the widget
+      // factory cannot unbind automatically.
+      this._namespaceID = this.eventNamespace.slice(1);
       // bump unique ID after assigning it to the widget instance
       this.multiselectID = multiselectID++;
 
@@ -511,6 +510,12 @@
         var $inputs = $this.next('ul').find('input').filter(':visible:not(:disabled)');
         var nodes = $inputs.get();
         var label = this.textContent;
+         
+        // if maxSelected is in use, cannot exceed it		  
+        var maxSelected = self.options.maxSelected;
+        if (maxSelected && (self.$inputs.filter(':checked').length + $inputs.length > maxSelected) ) {
+          return;
+        }
 
         // trigger before callback and bail if the return is false
         if (self._trigger('beforeoptgrouptoggle', e, { inputs:nodes, label:label }) === false) {
@@ -593,11 +598,10 @@
         var $tags = $element.find('option');
         var isMultiple = $element[0].multiple;
         var $allInputs = self.$inputs;
-        var inputCount = $allInputs.length;
         var numChecked = $allInputs.filter(":checked").length;
         var options = self.options;
         var optionText = $input.parent().find("span")[options.htmlOptionText ? 'html' : 'text']();
-        var selectedMax = options.selectedMax;
+        var maxSelected = options.maxSelected;
 
         // bail if this input is disabled or the event is cancelled
         if (input.disabled || self._trigger('click', e, { value: val, text: optionText, checked: checked }) === false) {
@@ -605,18 +609,10 @@
           return;
         }
 
-        if ( selectedMax && checked
-              && ( typeof selectedMax === 'function' ? !!selectedMax.call(input, $allInputs) : numChecked > selectedMax ) ) {
-          var saveText = options.selectedText;
-
-          // The following warning is shown in the button and then cleared after a second.
-          options.selectedText = "<center><b>LIMIT OF " + (numChecked - 1) + " REACHED!</b></center>";
-          self.update();
-          setTimeout( function() {
-            options.selectedText = saveText;
-            self.update();
-          }, 1000 );
-
+        if ( maxSelected && checked && numChecked > maxSelected) {
+         if ( self._trigger('maxselected', e, { labels: self.$labels, inputs: $allInputs }) !== false ) {
+            self.buttonMessage("<center><b>LIMIT OF " + (numChecked - 1) + " REACHED!</b></center>");
+         }
           input.checked = false;
           e.preventDefault();
           return false;
@@ -1280,22 +1276,47 @@
     },
 
     checkAll: function(e) {
+      this._trigger('beforeCheckAll');
       this._toggleChecked(true);
       this._trigger('checkAll');
     },
 
     uncheckAll: function() {
+      this._trigger('beforeUncheckAll');
+
       this._toggleChecked(false);
       if ( !this.element[0].multiple ) {
         // Forces the underlying single-select to have no options selected.
         this.element[0].selectedIndex = -1;
       }
+
       this._trigger('uncheckAll');
     },
 
     flipAll: function() {
-      this._toggleChecked('!');
-      this._trigger('flipAll');
+      this._trigger('beforeFlipAll');
+
+      var maxSelected = this.options.maxSelected;
+      if (maxSelected === null || maxSelected > (this.$inputs.length - this.$inputs.filter(':checked').length) ) {
+         this._toggleChecked('!');
+         this._trigger('flipAll');
+      }
+      else {
+         this.buttonMessage("<center><b>Flip All Not Permitted.</b></center>");
+      }
+    },
+
+    /**
+     * Flashes a message in the button caption for 1 second.
+     * Useful for very short warning messages to the user.
+     * @param {string} HTML message to show in the button.
+     */
+    buttonMessage: function(message) {
+       var self = this;
+       self.$buttonlabel.html(message);
+       setTimeout( function() {
+         self.update();
+       }, 1000 );
     },
 
     /**
@@ -1347,6 +1368,13 @@
       return this.$menu;
     },
 
+    /**
+     * @returns {string} namespaceID for use with external event handlers.
+     */
+    getNamespaceID: function() {
+      return this._namespaceID;
+    },
+
     /**
      * @returns {object} jQuery object for button
      */
@@ -1466,12 +1494,16 @@
         case 'checkAllText':
         case 'uncheckAllText':
         case 'flipAllText':
-          $menu.find('a.ui-multiselect-' + {'checkAllText': 'all', 'uncheckAllText': 'none', 'flipAllText': 'flip'}[key] + ' span').eq(-1).text(value);           // eq(-1) finds the last span
+          if (key !== 'checkAllText' || !this.options.maxSelected) {
+            $menu.find('a.ui-multiselect-' + {'checkAllText': 'all', 'uncheckAllText': 'none', 'flipAllText': 'flip'}[key] + ' span').eq(-1).text(value);           // eq(-1) finds the last span
+          }
           break;
         case 'checkAllIcon':
         case 'uncheckAllIcon':
         case 'flipAllIcon':
-          $menu.find('a.ui-multiselect-' + {'checkAllIcon': 'all', 'uncheckAllIcon': 'none', 'flipAllIcon': 'flip'}[key] + ' span').eq(0).replaceWith(value);  // eq(0) finds the first span
+          if (key !== 'checkAllIcon' || !this.options.maxSelected) {
+            $menu.find('a.ui-multiselect-' + {'checkAllIcon': 'all', 'uncheckAllIcon': 'none', 'flipAllIcon': 'flip'}[key] + ' span').eq(0).replaceWith(value);  // eq(0) finds the first span
+          }
           break;
         case 'openIcon':
           $menu.find('span.ui-multiselect-open').html(value);
@@ -1491,7 +1523,7 @@
           break;
         case 'selectedText':
         case 'selectedList':
-        case 'selectedMax':
+        case 'maxSelected':
         case 'noneSelectedText':
         case 'selectedListSeparator':
           this.options[key] = value;            // these all need to update immediately for the update() call
diff --git a/tests/unit/options.js b/tests/unit/options.js
index cb2889f..cff7899 100644
--- a/tests/unit/options.js
+++ b/tests/unit/options.js
@@ -82,11 +82,11 @@
       el.multiselect("destroy").remove();
     });
 
-    QUnit.test("selectedMax", function (assert) {
+    QUnit.test("maxSelected", function (assert) {
       var html = '<select multiple><option value="foo">foo &quot;with quotes&quot;</option><option value="bar">bar</option><option value="baz">baz</option></select>';
 
       el = $(html).appendTo("body").multiselect({
-          selectedMax: 2
+          maxSelected: 2
       });
 
       var checkboxes = el.multiselect("widget").find(":checkbox");
@@ -94,7 +94,7 @@
       checkboxes.eq(1).trigger('click');
       checkboxes.eq(2).trigger('click');
 
-      assert.equal(menu().find("input").filter(":checked").length, 2, 'after clicking each checkbox, count of checked restored to selectedMax of 2');
+      assert.equal(menu().find("input").filter(":checked").length, 2, 'after clicking each checkbox, count of checked restored to maxSelected of 2');
       el.multiselect("destroy").remove();
     });
 
@@ -202,7 +202,7 @@
       width = "3in";
       el.multiselect("option", "menuWidth", width).multiselect('refresh');
       assert.equal(menu().parent().find(".ui-multiselect-menu").outerWidth(), 3 * 96.0, 'menuWidth supports strings suffixed with "in" unit as well as integer "px" values');
-		
+
       el.multiselect("destroy");
     });