text direction in CK Editor

Another way to do it is directly from your view file, the benefit of using replace() method is that you can use different direction and style for each of your view.

CKEDITOR.replace( 'article_area', {
    contentsLangDirection: 'rtl'
} );

By using replace() you can also do other filtering stuff like allowing/disallowing tags and removing buttons from the editor. for a detailed description visit:

http://ckeditor.com/ckeditor_4.1rc/samples/datafiltering.html