By installing the wysiwyg module on your site you can easily integrate your drupal site with wysiwyg editors like TinyMCE , markitUP and FCKeditor. This really does simply the process of installing these editors. This allows on your drupal site the ability to edit comments and make postings  alot easier using standard formatting.

How to install a wysiwyg editor on your drupal site. 

1. Install drupal Module first from http://drupal.org/project/wysiwyg
2. Unzip file and drop the files into sites/all/modules directory
3. Goto the modules list on your site and turn on the module
4. Goto site config / wysiwyg . Choose which editor you require. In this case FCKeditor.
5. download and extract the FCKeditor into sites/all/modules/wysiwyg/fckeditor
6. Go to wysiwyg and setup Filtered HTML and FULL HTML to FCKeditor. Here you can select different editors for different input formats.
7. Edit the FCKeditor to select a limited selection of buttons,  (buttons and plugins)