Hey does anybody understand how to add your personal custom css classes towards the Wordpress admin wealthy text editor drop downs?

When editing a publish the thing is the drop downs to format the chosen text to become a paragraph, address or h3 tag. An amount be the best way to add a choice "Highlight" that will alter the selected text from:

selected text

to:

<span class="highlight">selected text</span>

Thanks!

If you are using WP3, use the next function inside your theme's functions.php file: http://codex.wordpress.org/Function_Reference/add_editor_style

More in depth instructions:

http://wordpress.org/support/topic/how-to-use-new-add_editor_style-function

Related SO question: How do I use new add_editor_style() function in wordPress?