<script>
function lightrow(el, len, cur) {
    if(cur >= 0) el[cur].style.background = '#ffffff';
    cur++;
    if(cur >= len) { cur = 0; }
    if(cur >= 0) el[cur].style.background = '#f76341';
    setTimeout(function(){lightrow(el, len, cur)}, 3400);
}
var tr = document.getElementById('mytable').getElementsByTagName('tr');
var trl = tr.length;
if(trl > 1) lightrow(tr, trl, -1);
</script>

<table id="mytable">.....