$(function() {
		   
// set opacity to nill on page load
$("ul#menu span").css("opacity","0");

// on mouse over
$("ul#menu span").hover(function () {
// animate opacity to full
$(this).stop().animate({
opacity: 1
}, 'slow');
},
// on mouse out
function () {
// animate opacity to nill
$(this).stop().animate({
opacity: 0
}, 'slow');
});

});