[danik.js]

<div class="tovar tovar-1">
<img src="tovar-1.jpg" alt="tovar1">
</div>
<div class="tovar tovar-2">
<img src="tovar-2.jpg" alt="tovar2">
</div>
<div class="tovar tovar-3">
<img src="tovar-3.jpg" alt="tovar3">
</div>
<div class="holder" style="border: 1px solid red"></div>
<script>
(function(){
    var images = document.querySelectorAll('.tovar img');
    var holder = document.querySelector('.holder');
    function onclick() {
        holder.appendChild(this);
    }
    for (var i = 0; i < images.length; i++) {
        images[i].onclick = onclick;
    }
})();
</script>