9− <input type="checkbox" name="category_{{ category }}" {% if category in selected_categories %}checked="checked"{% endif %} /><label for="checkbox_{{ category }}" class="cb"></label><label for="checkbox_{{ category }}">{{ category }}</label>
9+ <input type="checkbox" id="checkbox_{{ category|replace(' ', '_') }}" name="category_{{ category|replace(' ', '_') }}" {% if category in selected_categories %}checked="checked"{% endif %} /><label for="checkbox_{{ category }}" class="cb"></label><label for="checkbox_{{ category }}">{{ category }}</label>