= TagCloud
Generates a "tag cloud".

== Installation
Copy the assets/javascripts/tag_cloud.js file to your public/javascripts
folder.  Load the JavaScript in your layout:

 <%= javascript_include_tag 'tag_cloud' %>

This plugin requires the presence of the polymorphic version of
+acts_as_taggable+.  Look for it at
http://dev.rubyonrails.org/svn/rails/plugins/acts_as_taggable

== Usage
 <%= tag_cloud(:post, :tag_list, :limit => 20, :order => :popularity, :target_class => :post %>

Where:

* <tt>:limit</tt>: The maximum number of tags to show.  The default is 20.
* <tt>:order</tt>: In what order should the tags be shown.  Accepts
                   <tt>:popularity</tt> or <tt>:alpha</tt>.  The default is
                   <tt>:popularity</tt>.
* <tt>:target_class</tt>: Optional.  If the object is nil, this value becomes
                          required.  This option identifies which class we
                          should query to find the tags to use.
* <tt>:field_id</tt>: The field to modify (add/remove tag name).