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This plugin adds a new helper to the great RubyOnRails framework that allows to
generate multiple, dependent HTML select tags. It handles the relations with
simple JavaScript (requires prototype.js library), so you do not need to code
any AJAX callbacks (can be handy when you only deal with a small amount of
data). This plugin works also well with RJS templates and supports recursive
pre-selection of the related select tags (look on the examples).