<script>

var myAnimLeft = new YAHOO.util.Scroll('centerContent', {
   scroll: { to: [100, 0] }
});
var myAnimRight = new YAHOO.util.Scroll('centerContent', {
   scroll: { to: [-100, 0] }
});

YAHOO.util.Event.on('leftClick', 'click', function() {
    myAnimLeft.animate();
});
YAHOO.util.Event.on('rightClick', 'click', function() {
    myAnimRight.animate();
});

</script>