ruby script/plugin install http://svn.webtest.wvu.edu/repos/rails/plugins/textile_editor_helper/

Install

rake textile_editor_helper:install

Firstly make sure you have included prototype in your app

For the textarea(s) that you want to add the TEH toolbar to replace the text area tag with:

<%= textile_editor 'object', 'field' -%>

At the end of your form put in the following code:

<%= textile_editor_initialize -%>

== Simple vs. Extended

TEH has a built-in mode to show only a sub-selection of available tags called simple. Currently the 'simple' tags are: bold, underline, italic, strikethrough. To create a text area that will only use the 'simple' tags create your text area with the following code:

<%= textile_editor 'object', 'field', :simple -%>

== To modify Textile Editor Helper
Most of the options that you might want to modify (e.g. access keystroke or whether a tag is available in simple) are found in textile_editor_config.js. Pretty straightforward.

There is currently no advanced documentation for this plugin.