diff --git a/javascript/PermissionCheckboxSetField.js b/javascript/PermissionCheckboxSetField.js
new file mode 100644
index 000000000..b141eb9ae
--- /dev/null
+++ b/javascript/PermissionCheckboxSetField.js
@@ -0,0 +1,34 @@
+(function($) {
+	Behaviour.register({
+		/**
+		 * Automatically check and disable all checkboxes if ADMIN permissions are selected.
+		 * As they're disabled, any changes won't be submitted (which is intended behaviour),
+		 * checking all boxes is purely presentational.
+		 */
+		'.permissioncheckboxset .valADMIN input': {
+			initialize: function() {
+				this.toggleCheckboxes();
+			},
+			onclick: function(e) {
+				this.toggleCheckboxes();
+			},
+			toggleCheckboxes: function() {
+				var checkboxes = $(this).parents('.field:eq(0)').find('.checkbox').not(this);
+
+				if($(this).is(':checked')) {
+					checkboxes.each(function() {
+						$(this).data('SecurityAdmin.oldChecked', $(this).attr('checked'));
+						$(this).data('SecurityAdmin.oldDisabled', $(this).attr('disabled'));
+						$(this).attr('disabled', 'disabled');
+						$(this).attr('checked', 'checked');
+					});
+				} else {
+					checkboxes.each(function() {
+						$(this).attr('checked', $(this).data('SecurityAdmin.oldChecked'));
+						$(this).attr('disabled', $(this).data('SecurityAdmin.oldDisabled'));
+					});
+				}
+			}
+		}
+	});
+}(jQuery));
\ No newline at end of file
diff --git a/security/PermissionCheckboxSetField.php b/security/PermissionCheckboxSetField.php
index 53d4d0067..f93d94eb0 100644
--- a/security/PermissionCheckboxSetField.php
+++ b/security/PermissionCheckboxSetField.php
@@ -72,6 +72,7 @@ class PermissionCheckboxSetField extends FormField {
 
 	function Field() {
 		Requirements::css(SAPPHIRE_DIR . '/css/CheckboxSetField.css');
+		Requirements::javascript(SAPPHIRE_DIR . '/javascript/PermissionCheckboxSetField.js');
 		
 		$uninheritedCodes = array();
 		$inheritedCodes = array();