$(function() {
// OPACITY OF BUTTON SET TO 50%
$("#nav a").css("opacity","0.50");

// ON MOUSE OVER
$("#nav a").hover(function () {
 
// SET OPACITY TO 100%
$(this).stop().animate({
opacity: 0.75
}, "slow");
},
	 
// ON MOUSE OUT
function () {

// SET OPACITY BACK TO 50%
$(this).stop().animate({
opacity: 0.5
}, "slow");
});
});