Loop Jquery by time (setInterval)

setInterval((your funcition),(time change));

example: setInterval(function(){alert("Hello")}, 3000);

//----------------------Script-----------------------------------------------------------------------------------
<script>
    $(document).ready(function () {
    var change_img_time     = 5000;
    var transition_speed    = 1000;
    var simple_slideshow    = $("#ex"),
        listItems           = simple_slideshow.children('tr'),
        listLen             = listItems.length,
        i                   = 0,
        changeList = function () {
            listItems.eq(i).fadeOut(transition_speed, function () {
                i += 1;
                if (i === listLen) {
                    i = 0;
                }
                listItems.eq(i).fadeIn(transition_speed);
            });
        };
    listItems.not(':first').hide();
    setInterval(changeList, change_img_time);
</script>

//-------Html-------------------------------------------------------------------------------------------------------
<table>
    <tbody id="ex">
        <tr>
            <td><a href=""><img style="width:100%" src="img/thumb-7LK07YGs32_320x320.jpg"></a></td>
            <td><a href=""><img style="width:100%" src="img/thumb-44WF12_320x320.jpg"></a></td>
            <td><a href=""><img style="width:100%" src="img/thumb-44S322_320x320.jpg"></a></td>
        </tr>
        <tr>
                    <td><a href=""><img style="width:100%" src="img/thumb-7LK07YGs32_320x320.jpg"></a></td>
                    <td><a href=""><img style="width:100%" src="img/thumb-44WF12_320x320.jpg"></a></td>
                    <td><a href=""><img style="width:100%" src="img/thumb-44S322_320x320.jpg"></a></td>
                </tr>
    </tbody>
</table>