Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 3910)
+++ /CKEditor/trunk/CHANGES.html	(revision 3911)
@@ -143,4 +143,5 @@
 		<li><a href="http://dev.fckeditor.net/ticket/3956">#3956</a> : Fixed About dialog in Source Mode for IE.</li>
 		<li><a href="http://dev.fckeditor.net/ticket/3953">#3953</a> : Fixed keystroke for close Paste dialog.</li>
+		<li><a href="http://dev.fckeditor.net/ticket/3951">#3951</a> : Reset size and lock ratio options were not accessible in Image dialog.</li>
 	</ul>
 	<h3>
Index: /CKEditor/trunk/_source/plugins/dialog/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/dialog/plugin.js	(revision 3910)
+++ /CKEditor/trunk/_source/plugins/dialog/plugin.js	(revision 3911)
@@ -1,3 +1,3 @@
-/*
+/*
 Copyright (c) 2003-2009, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.html or http://ckeditor.com/license
@@ -443,4 +443,33 @@
 	};
 
+	// Focusable interface. Use it via dialog.addFocusable.
+	function Focusable( dialog, element, index ) {
+		this.element = element;
+		this.focusIndex = index;
+		this.isFocusable = function()
+		{
+			return true;
+		};
+		this.focus = function()
+		{
+			dialog._.currentFocusIndex = this.focusIndex;
+			this.element.focus();
+		};
+		// Bind events
+		element.on( 'keydown', function( e )
+			{
+				if ( e.data.getKeystroke() in { 32:1, 13:1 }  )
+					this.fire( 'click' );
+			} );
+		element.on( 'focus', function()
+			{
+				this.fire( 'mouseover' );
+			} );
+		element.on( 'blur', function()
+			{
+				this.fire( 'mouseout' );
+			} );
+	}
+
 	CKEDITOR.dialog.prototype =
 	{
@@ -989,4 +1018,24 @@
 		{
 			return this.getParentEditor().getSelection().getSelectedElement();
+		},
+
+		/**
+		 * Adds element to dialog's focusable list.
+		 *
+		 * @param {CKEDITOR.dom.element} element
+		 * @param {Number} [index]
+		 */
+		addFocusable: function( element, index ) {
+			if ( typeof index == 'undefined' )
+			{
+				index = this._.focusList.length;
+				this._.focusList.push( new Focusable( this, element, index ) );
+			}
+			else
+			{
+				this._.focusList.splice( index, 0, new Focusable( this, element, index ) );
+				for ( var i = index + 1 ; i < this._.focusList.length ; i++ )
+					this._.focusList[ i ].focusIndex++;
+			}
 		}
 	};
Index: /CKEditor/trunk/_source/plugins/image/dialogs/image.js
===================================================================
--- /CKEditor/trunk/_source/plugins/image/dialogs/image.js	(revision 3910)
+++ /CKEditor/trunk/_source/plugins/image/dialogs/image.js	(revision 3911)
@@ -347,4 +347,7 @@
 				if ( dialogType != 'image' )
 					this.hidePage( 'Link' );		//Hide Link tab.
+				var doc = this._.element.getDocument();
+				this.addFocusable( doc.getById( 'btnLockSizes' ), 5 );
+				this.addFocusable( doc.getById( 'btnResetSize' ), 5 );
 			},
 			onHide : function()
@@ -615,9 +618,9 @@
 															resetButton.on( 'mouseover', function()
 																{
-																	this.addClass( 'BtnOver' );
+																	this.addClass( 'cke_btn_over' );
 																}, resetButton );
 															resetButton.on( 'mouseout', function()
 																{
-																	this.removeClass( 'BtnOver' );
+																	this.removeClass( 'cke_btn_over' );
 																}, resetButton );
 														}
@@ -643,17 +646,17 @@
 															ratioButton.on( 'mouseover', function()
 																{
-																	this.addClass( 'BtnOver' );
+																	this.addClass( 'cke_btn_over' );
 																}, ratioButton );
 															ratioButton.on( 'mouseout', function()
 																{
-																	this.removeClass( 'BtnOver' );
+																	this.removeClass( 'cke_btn_over' );
 																}, ratioButton );
 														}
 													},
 													html : '<div>'+
-														'<div title="' + editor.lang.image.lockRatio +
-														'" class="cke_btn_locked" id="btnLockSizes"></div>' +
-														'<div title="' + editor.lang.image.resetSize +
-														'" class="cke_btn_reset" id="btnResetSize"></div>'+
+														'<a href="javascript:void(0)" tabindex="-1" title="' + editor.lang.image.lockRatio +
+														'" class="cke_btn_locked" id="btnLockSizes"></a>' +
+														'<a href="javascript:void(0)" tabindex="-1" title="' + editor.lang.image.resetSize +
+														'" class="cke_btn_reset" id="btnResetSize"></a>'+
 														'</div>'
 												}