jquery Pop up window can not open in Rails 3

I am making one application and i want to open one registration form in popup window when user will click on a link.I have done some coding but still unable to open it.Please check my codes explained below and let me to know where i did the mistake and how to resolve this.

views/users/index.html.erb

<table>
    <tr>
        <th>Name</th> 
        <th>Email id</th> 
        <th>Password</th>
    </tr>
    <% @users.each do |user| %>
    <tr>
        <td><%= user.name %></td>
        <td><%= user.email %></td>
        <td><%= user.Password %></td>
    </tr>
    <% end %>
</table>
<p>
    <%= link_to 'New Task', users_new_path, :id => 'onclick',remote: true  %>
</p>
<div id="task-form" style="display:none;"></div>

views/users/new.js.erb

$('#task-form').html("<%= j (render 'form') %>");
$(document).ready(function() {
    $("#onclick").click(function() {
$("#contactdiv").css("display", "block");
});
$("#contact #cancel").click(function() {
$(this).parent().parent().hide();
});
});

views/users/new.html.erb

<%= render 'form' %>

users_controller.rb

class UsersController < ApplicationController
    def index
        @users=User.all
        respond_to do |format|
            format.html
            format.json
        end
    end
    def new
        @users=User.new
    end
    def create
        @users=User.new(params[:users])
        if @users.save
            flash[:notice]="User has created successfully"
            flash[:color]="valid"
            redirect_to 'index'
        else
            flash[:alert]="User couldnot created"
            flash[:color]="invalid"
            render 'new'
        end
    end
end

views/users/_form.html.erb

<div id="contactdiv">
<%= form_for :users,:url => {:action => 'create'},:html => {:class => 'form',:id => 'contact'} do |f| %>
<img src="/assets/closebtn.png" class="img" id="cancel"/>
<p>
    Name:<%= f.text_field :name,placeholder:"Enter your name" %>
</p>
<p>
    Email Id:<%= f.email_field :email,placeholder: "Enter your email" %>
</p>
<p>
    Password:<%= f.password_field :password,placeholder:"Enter your password" %>
</p>
<p>
    <%= f.submit "Submit" %>
</p>
<input type="button" id="cancel" value="Cancel"/>
<% end %>
</div>

Please help me.