Koumpounophobia is powered by jQuery, and enhances the WordPress HTML Editor button bar in 5 ways:
The Koumpounophobia Settings menu lets you control which buttons appear on the button bar, and provides a form for creating your own buttons. It also provides instructions for creating custom modal dialogs. Koumpounophobia's display/dialogs.html file provides a good set of examples for creating your own modal dialogs.
A .pot file is included for localization, and a Russian translation is included.
My Post-to-Post Links II plugin uses Koumpounophobia to add its own button to the HTML Editor. That plugin is a good example to work from if you're a plugin author.
If you're wondering about the name, Koumpounophobia is a phobia of buttons. I figured it was appropriate since there haven't been any improvements to the WordPress HTML Editor in years. ;-)
The latest version of Koumpounophobia works well in the browsers I have tested so far: Firefox 3, Internet Explorer 7 and 8, and Google Chrome. Please let me know if you encounter any problems in your browser. (I've noticed the HTML Editor is "jumpy" in Internet Explorer 8. This is not related to Koumpounophobia. The scroll position within the editor will sometimes change randomly even without Koumpounophobia installed).
Installation Instructions
Download the zip file, unzip it, and copy the "koumpounophobia" folder to your plugins directory. Then activate it from your plugin panel. After successful activation, you'll see some changes to your HTML Editor buttons bar. You can use the Koumpounophobia Settings menu to control the changes to your button bar.




