$(function() {
// OPACITY OF BUTTON SET TO 100%
$("#navigation a").css("opacity","1.0");

// ON MOUSE OVER
$("#navigation a").hover(function () {

// SET OPACITY TO 30%
$(this).stop().animate({
opacity: 0.4
}, "slow");
},

// ON MOUSE OUT
function () {

// SET OPACITY BACK TO 100%
$(this).stop().animate({
opacity: 1.0
}, "slow");
});
});