$(function() {
$("#box").css("opacity","0.5");
$("#box").stop().animate({
opacity: 1.0
}, "slow");

$('#side-a').click(function () {
$("#box").css("opacity","0.5");
$("#box").stop().animate({
opacity: 1.0
}, "slow");
});

$('#side-b').click(function () {
$("#box").css("opacity","0.5");
$("#box").stop().animate({
opacity: 1.0
}, "slow");
});

});