$(document).ready(function() {
	
	$(window).scroll(function()
	{
		var top = ($(window).scrollTop() == 0)? 0 : (($(window).scrollTop() <= 400)? 0 : ($(window).scrollTop() - 400)); 
		$('#sidebar').animate({top: top+"px"  },{queue: false, duration: 350});  
	});
	
	
	
});