lastScrollY = 0; function heartBeat(){ var diffY; if (document.documentElement && document.documentElement.scrollTop) diffY = document.documentElement.scrollTop; else if (document.body) diffY = document.body.scrollTop else {/*Netscape stuff*/} percent=.1*(diffY-lastScrollY); if(percent>0)percent=Math.ceil(percent); else percent=Math.floor(percent); document.getElementById("GBrightDiv").style.top = parseInt(document.getElementById("GBrightDiv").style.top)+percent+"px"; lastScrollY=lastScrollY+percent; } //滚动，注释掉就不会随屏幕滚动 window.setInterval("heartBeat()",1); //关闭按钮 function close_gol(){ givebestDiv.style.visibility='hidden'; } //css document.writeln("