Ruby on Rails

Hello,
could you please explain what's wrong with this code:

Rails 3.1.1

skills_controller.rb

class SkillsController < ApplicationController

# GET /skills
# GET /skills.json
def index
@skills = Skill.all

respond_to do |format|
format.html # index.html.erb
#format.json { render json: @skills }
format.js
end
end
end

index.html.erb

<%= collection_select(nil, :id, @skills, :id, :title, {:prompt=>"Select one", :id=>:id},{:id=>"select_skill"}) %>
<div id="skills_list">
</div>

app/assets/javascripts/index.js

$(document).ready(function()
{
$("#select_skill").change(function()
{
$("#skills_list").append("<%= escape_javascript(render :partial=>'skills_list') %>");
});
});

_skills_list.html.erb

<div id="skills_list">
<table>
<tr>
<th>Title</th>
<th>Parent</th>
</tr>

<% @skills.each do |skill| %>
<tr>
<td><%= skill.title %></td>
<td><%= skill.parent_id %></td>
</tr>
<% end %>
</table>

</div>

It finally prints <%= escape_javascript(render :partial=>'skills_list') %> instead of rendering skills list. I would appreciate if you tell me why.

Thank you in advance,
Dmitry.

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