def show_loading_page(self):
        """Show a loading animation while the kernel is starting."""
        loading_template = Template(LOADING)
        loading_img = get_image_path('loading_sprites.png')
        if os.name == 'nt':
            loading_img = loading_img.replace('\\', '/')
        message = _("Connecting to kernel...")
        page = loading_template.substitute(css_path=CSS_PATH,
                                           loading_img=loading_img,
                                           message=message)
        self.setHtml(page)
Show a loading animation while the kernel is starting.