/*lastScrollY=0;
function heartBeat(){
diffY=document.body.scrollTop;
percent=.3*(diffY-lastScrollY);
if(percent>0)percent=Math.ceil(percent);
else percent=Math.floor(percent);
document.all.lovexin1.style.pixelTop+=percent;
document.all.lovexin2.style.pixelTop+=percent;
lastScrollY=lastScrollY+percent;
}*/
function hide()  
{   
lovexin1.style.visibility="hidden"; 
lovexin2.style.visibility="hidden";
}
/*window.setInterval("heartBeat()",1);*/

$(window).scroll(function() {    // 页面发生scroll事件时触发  
	var bodyTop = 0;  
	if (typeof window.pageYOffset != 'undefined') {  
		bodyTop = window.pageYOffset;  
	} else if (typeof document.compatMode != 'undefined' && document.compatMode != 'BackCompat') {  
		bodyTop = document.documentElement.scrollTop;  
	}  
	else if (typeof document.body != 'undefined') {  
		bodyTop = document.body.scrollTop;  
	}  

	$(".dl").css("top", 50 + bodyTop)
});