django user authenication form in modal form twitter bootstrap

Hello 

I am new to django I am trying to use modal (bootstrap) for embed by login form. I am using the following error. I have mentioned my code below and tried lot of googling... still no use.

Help

Reason given for failure:

    CSRF token missing or incorrect.    

Here is code in view.py 

from django.shortcuts import render_to_response

from django.http import HttpResponseRedirect

from django.contrib import auth

from django.core.context_processors import csrf

from django.template import RequestContext

from django.views.decorators.csrf import csrf_protect

from django.shortcuts import render

@csrf_protect

def login(request):

    c={}

    c.update(csrf(request))

    return render_to_response('login.html',c,context_instance=RequestContext(request))

I call the login.html via link in nav bar using 

 <li><a href="/accounts/login/" data-toggle="modal" data-target="#myModal">Login</a></li>

That is code for login.html which is modal included in my base.html 

<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">

    <div class="modal-dialog">

        <div class="modal-content">

            <div class="modal-header">

                <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>

                <h4 class="modal-title" id="myModalLabel">Modal title</h4>

            </div>

            <div class="modal-body">

                <form action='/accounts/auth/' method='post'>{% csrf_token %}

                    <label for="username">User Name:</label>

                    <input type="text" name="username" value="" id="username">

                    <label for="password">Password:</label>

                    <input type="password" name="password" value="" id="password">

                    <input type="Submit" value="login" class="btn btn-primary">

                </form>

            </div>

            <div class="modal-footer">

                <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>

                <button type="button" class="btn btn-primary">Save changes</button>

            </div>

        </div>

    </div>

</div>

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