$(function() {
                $(window).scroll(function(){
					var scrollTop = $(window).scrollTop();
					if(scrollTop != 0)
						$('#nav').stop().animate({'opacity':'0.2'},400);
					else	
						$('#nav').stop().animate({'opacity':'1'},400);
				});
				
				$('#nav').hover(
					function (e) {
						var scrollTop = $(window).scrollTop();
						if(scrollTop != 0){
							$('#nav').stop().animate({'opacity':'1'},400);
						}
					},
					function (e) {
						var scrollTop = $(window).scrollTop();
						if(scrollTop != 0){
							$('#nav').stop().animate({'opacity':'0.2'},400);
						}
					}
				);
});