$(function() {
// OPACITY OF BUTTON SET TO 50%
$(".sidebar-box").css("opacity","1");
		
// ON MOUSE OVER
$(".sidebar-box").hover(

function () {
										  
// SET OPACITY TO 100%
$(this).stop().animate({opacity: 0.9}, "fast");
},
		
// ON MOUSE OUT
function () {
			
// SET OPACITY BACK TO 50%
$(this).stop().animate({opacity: 1}, "slow");
});

});