Counter and click event uisng jquery

<a href="javascript:void(0)" class="skip-091" style="display:none"><span>Skip ad in: </span> <span class="counter">5</span> seconds</a>

<script>

var countDown = function() {
var ct = 5;
var $elem = $(this);
var display = function() {
$elem.text(ct--);
}
var iv = setInterval(function() {
display();
if (ct === 0) {
clearInterval(iv);
$('.skip-091').html('Skip Ad');
}
}, 1000);
display();
};
$(".counter").each(countDown);


</script>