document.addEventListener('DOMContentLoaded', function () {

    const lessons = document.querySelectorAll('.lesson-list li');

    lessons.forEach(lesson => {

        const imageTd = lesson.querySelector('td.item-image');
        if (!imageTd) return;

        const style = imageTd.getAttribute('style') || '';

        if (style.includes('url(')) {
            lesson.classList.add('lesson-has-img');
        } else {
            lesson.classList.add('lesson-no-img');
        }

    });

});