$(function(){
			var name = $('#adv');  //滚动广告的ID
			function showAd(time){
					setTimeout(function(){
						$(name).show();},time);
				}
				
			function hideAd(time){
					setTimeout(function(){
						$(name).hide();},time);
				}

			$('#close').click(function(){
					$(name).hide();
				});
		
			
			showAd(1000); //页面加载完毕多久后显示广告
			
			//hideAd(31000); //页面加载完毕多久后关闭广告

			function scrollAd(){
					var offset = 295 + $(document).scrollTop();
					$(name).animate({top:offset},{duration:800,queue:false});
				}	
				
			scrollAd();
			
			$(window).scroll(scrollAd);
		});