edit_book

def edit_book(request, book_id):
	params = {}
	params.update(csrf(request))
	params['book'] = Book.objects.get(id=book_id)
	params['form'] = BookForm(instance=params['book'])
	if request.POST:
		editbook_form = BookForm(request.POST, instance=params['book'])
		if editbook_form.is_valid():
			return redirect("/store/book/" + book_id + "")
		else:
			params['form'] = editbook_form
	else:
		return render_to_response('store/add_book.html', params)