function dragStart(e){
var img = new Image();
img.src = "/path/image.jpg";
e.dataTransfer.setDragImage(img, 0, 0);
}
var tabs = document.querySelector('#advert-add__tabs');
document.querySelector('#advert-add__cat').addEventListener('change', function(e) {
var tabIndex = Array.prototype.slice.call(document.querySelectorAll('#advert-add__cat option')).indexOf(this.querySelector(':checked'));
tabs.querySelector('.active-advert-add').classList.remove('active-advert-add');
tabs.querySelector(`div:nth-child(${tabIndex+1})`).classList.add('active-advert-add');
});
var a = 1;
$('#button').on('click', function() {
$('#block').html(a++);
});