</body>
</html>
<script type="text/javascript">
var leftTd = $("leftTd");
var rightTd = $("rightTd");
var Button2 = $("Button2");
var plusTd = rightTd;
var subTd = leftTd;
var leftOrRight = true; // true is left, flase is right
var timer = false;
var offset = 1;