spell check icon not display on toolbar

Hi, Please give me steps to enable SCAYT plugin in ckeditor. I have tried many things like "config.scayt_autoStartup = true;". Please, let me know the steps to enable to scayt plugin. My config.js is as below

CKEDITOR.editorConfig = function( config ) {

Define changes to default configuration here. For example: config.language = 'fr'; config.uiColor = '#AADC6E'; config.filebrowserBrowseUrl = '/js/ckfinder/ckfinder.html';

config.filebrowserImageBrowseUrl = '/js/ckfinder/ckfinder.html?Type=Images'; config.filebrowserFlashBrowseUrl = '/js/ckfinder/ckfinder.html?Type=Flash'; config.filebrowserUploadUrl = '/js/ckfinder/core/connector/php/connector.php?command=QuickUpload&type=Files'; config.filebrowserImageUploadUrl = '/js/ckfinder/core/connector/php/connector.php?command=QuickUpload&type=Images'; config.filebrowserFlashUploadUrl = '/js/ckfinder/core/connector/php/connector.php?command=QuickUpload&type=Flash';

config.toolbar = 'testToolbar'; config.removePlugins = 'elementspath'; config.toolbar_engajerToolbar = [

{ name: 'basicstyles', items : [ 'Bold','Italic', 'Underline', '-'] }, { name: 'paragraph', items : [ 'Strike', 'JustifyLeft','JustifyCenter','JustifyRight','JustifyBlock','BulletedList',

'NumberedList','Undo','Redo','Link','Unlink' ] }

];

};

Thanks in advace.