function responsiveImageLoading() {
                var images = document.getElementsByClassName('thumbnail-image-responsive');

                for (var i = images.length - 1; i >= 0; i--) {
                    var size = 'large';

                    size = images[i].offsetWidth < 151 && images[i].offsetWidth > 0 ? 'small' : size;
                    size = images[i].offsetWidth > 150 && images[i].offsetWidth > 0 ? 'medium' : size;
                    size = images[i].offsetWidth > 300 ? 'large' : size;

                    images[i].setAttribute('src', images[i].getAttribute('data-src-' + size));
                }
            }

            setTimeout(function() {
                responsiveImageLoading(); // Update imagesizes
            }, 300);