Index: /FCKeditor/trunk/editor/_source/commandclasses/fckshowblocks.js
===================================================================
--- /FCKeditor/trunk/editor/_source/commandclasses/fckshowblocks.js	(revision 702)
+++ /FCKeditor/trunk/editor/_source/commandclasses/fckshowblocks.js	(revision 702)
@@ -0,0 +1,130 @@
+/*
+ * FCKeditor - The text editor for Internet - http://www.fckeditor.net
+ * Copyright (C) 2003-2007 Frederico Caldeira Knabben
+ *
+ * == BEGIN LICENSE ==
+ *
+ * Licensed under the terms of any of the following licenses at your
+ * choice:
+ *
+ *  - GNU General Public License Version 2 or later (the "GPL")
+ *    http://www.gnu.org/licenses/gpl.html
+ *
+ *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
+ *    http://www.gnu.org/licenses/lgpl.html
+ *
+ *  - Mozilla Public License Version 1.1 or later (the "MPL")
+ *    http://www.mozilla.org/MPL/MPL-1.1.html
+ *
+ * == END LICENSE ==
+ *
+ * FCKShowBlockCommand Class: the "Show Blocks" command.
+ */
+
+var FCKShowBlockCommand = function( name )
+{
+	this.Name = name ;
+	this.CSSText = this._GetCSSText( ['p', 'div', 'pre', 'address', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6'] ) ;
+	this.StyleSheetObj = null ;
+}
+FCKShowBlockCommand.prototype.Execute = function()
+{
+	if ( this._IsVisible() )
+		this._SetInvisible() ;
+	else
+		this._SetVisible() ;
+	FCK.Events.FireEvent( 'OnSelectionChange' ) ;
+}
+FCKShowBlockCommand.prototype.GetState = function()
+{
+	if ( FCK.EditMode != FCK_EDITMODE_WYSIWYG )
+		return FCK_TRISTATE_DISABLED ;
+	return this._IsVisible() ? FCK_TRISTATE_ON : FCK_TRISTATE_OFF ;
+}
+FCKShowBlockCommand.prototype._IsVisible = function()
+{
+	// The try.. catch... statements are here because accessing a stylesheet object of an inactive 
+	// document would raise access denied error in IE.
+	// In such a case, we should clear the reference to prevent further errors, before returning false.
+	try
+	{
+		if ( ! this.StyleSheetObj )
+			return false ;
+	}
+	catch ( e )
+	{
+		this.StyleSheetObj = null ;
+		return false ;
+	}
+	if ( FCKBrowserInfo.IsIE )
+	{
+		try
+		{
+			if ( this.StyleSheetObj.cssText == '' 
+					|| ! this.StyleSheetObj.owningElement 
+					|| this.StyleSheetObj.owningElement.ownerDocument != FCK.EditorDocument )
+				return false ;
+			else
+				return true ;
+		}
+		catch ( e )
+		{
+			this.StyleSheetObj = null ;
+			return false ;
+		}
+	}
+	else
+	{
+		if ( this.StyleSheetObj.parentNode && this.StyleSheetObj.ownerDocument == FCK.EditorDocument )
+			return true ;
+		else
+			return false ;
+	}
+}
+FCKShowBlockCommand.prototype._SetVisible = function()
+{
+	if ( FCK.EditMode != FCK_EDITMODE_WYSIWYG )
+		return ;
+	if ( ! this.StyleSheetObj )
+	{
+		this.StyleSheetObj = FCKTools._AppendStyleString( FCK.EditorDocument, this.CSSText ) ;
+		return ;
+	}
+
+	if ( FCKBrowserInfo.IsIE )
+		this.StyleSheetObj.cssText = this.CSSText ;
+	else
+		FCK.EditorDocument.getElementsByTagName( 'head' )[0].appendChild( this.StyleSheetObj ) ;
+}
+FCKShowBlockCommand.prototype._SetInvisible = function()
+{
+	if ( FCK.EditMode != FCK_EDITMODE_WYSIWYG )
+		return ;
+	if ( ! this.StyleSheetObj )
+		return ;
+
+	if ( FCKBrowserInfo.IsIE )
+		this.StyleSheetObj.cssText = '' ;
+	else
+	{
+		if ( this.StyleSheetObj.parentNode )
+			this.StyleSheetObj.parentNode.removeChild( this.StyleSheetObj ) ;
+	}
+}
+FCKShowBlockCommand.prototype._GetCSSText = function( tags )
+{
+	var template = '$TAG'
+			+ '{'
+			+ 'background-image: url($BASEPATHimages/block_$TAG.png);' 
+			+ 'background-repeat: no-repeat;' 
+			+ 'border: 1px dotted gray;'
+			+ 'padding-top: 8px;'
+			+ 'padding-left: 8px;'
+			+ '}\n';
+
+	var retval = '' ;
+	for ( var i = 0 ; i < tags.length ; i++ )
+		retval += template.replace( new RegExp( '\\$TAG', 'g' ), tags[i] ) ;
+	retval = retval.replace( new RegExp( '\\$BASEPATH', 'g' ), FCKConfig.BasePath ) ;
+	return retval ;
+}