index.rhtml is...
<%= javascript_include_tag :defaults %>
<%= collection_select(nil, :genre_id,  @genres,  :id, :name,
                      {:prompt   => "Select a Genre"},
                      {:onchange =>"
alert(''sd'');"}) %>
<br/>
<div id="artists"><%= render :partial =>
''artists'', :object => @artists
%></div>
<div id="songs"><%= render :partial =>
''songs'',   :object => @songs
%></div>
controller is...
def update_artists
    # updates artists and songs based on genre selected
     @genre = Genre.find(params[:genre_id])
    @artists = @genre.artists
    @songs   = @genre.songs
    render :update do |page|
      page.replace_html''artists'', :partial =>
''artists''
      page.replace_html ''songs'',   :partial =>
''songs'',   :object =>
songs
    end
  end
if i select values in first drop down i cant get corresponding values 
for second as well as for third.. pls help
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