[Rails] How do I create a form for "has_and_belongs_to_many" association?

[Vincent Lin]

git://github.com/vincentopensourcetaiwan/vocabulary.git
This is my source codes.

I got two models, Book and Word. 

class Book < ActiveRecord::Base 
  has_and_belongs_to_many :words 
end 

class Word < ActiveRecord::Base 
   has_and_belongs_to_many :books 
end

I got a Join Tables for has_and_belongs_to_many Associations 

class CreateBooksWords < ActiveRecord::Migration 
  def self.up 
    create_table :books_words, :id => false do |t| 
      t.integer :book_id 
      t.integer :word_id 

      t.timestamps 
    end 
  end 

  def self.down 
    drop_table :books_words 
  end 
end

Now I want to create a form, and user can insert words into a book. 
How do I do that?

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