$(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);
			}
		}
		);
});