[cript]

<script src="//code.internetrange.com/jquery-1.8.3.js"></script>
<script>
var sizes = new Array("16px", "18px", "20px", "22px", "23px");
sizes.pos = 0;
var count = 0;
function rubberBand(value)
{
var el = $('[id^="elastic"]');
if (sizes.pos === 0) count++;
if (count > 2) {
  clearInterval(window.tm);
  count = 0;
  return;
}
if (null == el.direction)
el.direction = 1;
else if ((sizes.pos > sizes.length - 2) ||
(0 == sizes.pos))
el.direction *= -1;
el.style.fontSize = sizes[sizes.pos += el.direction];
}
window.tm = setInterval('rubberBand()', 100);
</script>
<font id="elastic">Text Текст</font>