$(function(){
	$('.menu').each(function(){
		var parent = $(this).parent();
		var dTop = $(this).offset().top;
		var elem = $(this);
		parent.css('position','relative');
		elem.css('position', 'absolute');
		$(window).scroll(function(){
			if(scrollY()>dTop){
				elem.stop().animate({top:scrollY()-parent.offset().top},500)
			}else{
				elem.stop().animate({top:dTop-parent.offset().top},500)
			}
		});
			if(scrollY()>dTop){
				elem.stop().animate({top:scrollY()-parent.offset().top},500)
			}
	});
});

function scrollY(){
	scrOfY=0;
	if(typeof(window.pageYOffset)== 'number'){
		scrOfY= window.pageYOffset;
	}else if (document.body && (document.body.scrollTop)){
		scrOfY = window.body.scrollTop;
	}else if (document.documentElement && (document.documentElement.scrollTop)){
		scrOfY= document.documentElement.scrollTop;
	}
return scrOfY;
}