problem to modify my toolbar

hello , i'm french, so please excuse my english...

i try to modify my toolbar, to add the text justify buttons...

i add "['JustifyLeft','JustifyCenter','JustifyRight','JustifyBlock']," in the config.js file, but doesn't work...

here is my config.js :

CKEDITOR.editorConfig = function( config )
{
// Define changes to default configuration here. For example:
// config.language = 'fr';
// config.uiColor = '#AADC6E';
//config.filebrowserUploadUrl = '/filemanager/upload.php';
//config.filebrowserUploadUrl = '/admin/upload.php';
//config.stylesCombo_stylesSet = 'css/styles.css';

config.toolbar = 'MyToolbar';


config.toolbar_MyToolbar =
[
['Bold','Italic','Underline','Strike','-','Subscript','Superscript'],
['FontSize'],
['JustifyLeft','JustifyCenter','JustifyRight','JustifyBlock'],
['Styles','Format','TextColor'],
['Undo','Redo','-','Find','Replace'],
['Link','Unlink','Anchor'],
['Image','SpecialChar'],
];

config.toolbar_Full =
[
['Source','-','Save','NewPage','Preview','-','Templates'],
['Cut','Copy','Paste','PasteText','PasteFromWord','-','Print', 'SpellChecker', 'Scayt'],
['Undo','Redo','-','Find','Replace','-','SelectAll','RemoveFormat'],
['Form', 'Checkbox', 'Radio', 'TextField', 'Textarea', 'Select', 'Button', 'ImageButton', 'HiddenField'],
'/',
['Bold','Italic','Underline','Strike','-','Subscript','Superscript'],
['NumberedList','BulletedList','-','Outdent','Indent','Blockquote'],
['JustifyLeft','JustifyCenter','JustifyRight','JustifyBlock'],
['Link','Unlink','Anchor'],
['Image','Flash','Table','HorizontalRule','Smiley','SpecialChar','PageBreak'],
'/',
['Styles','Format','Font','FontSize'],
['TextColor','BGColor'],
['Maximize', 'ShowBlocks','-','About']
];

config.toolbar_Basic =
[
['Bold', 'Italic', '-', 'NumberedList', 'BulletedList', '-', 'Link', 'Unlink','-','About']
];


};


teh text align buttons doesnt appears on my website


anyone has an idea

thank'