/**
 * Spustí slideshow nad obrázky v elementu 'img_slide'.
 */
function initSlide() {
    var IMAGE_DELAY = 3000,
        FADE_DURATION = 600,
        image = jQuery('#img_slide').children();

    setTimeout(function() {
        image.animate({
            opacity: 1
        }, FADE_DURATION);
    }, IMAGE_DELAY);

    setInterval(function() {
        image.animate({
            opacity: 0
        }, FADE_DURATION);

        setTimeout(function() {
            image.animate({
                opacity: 1
            }, FADE_DURATION);
        }, IMAGE_DELAY);
    }, IMAGE_DELAY * 2);
}

jQuery(initSlide);