//图片向上滚动代码

   var rollspeed=50

   rolllink2.innerHTML=rolllink1.innerHTML //克隆rolllink1为rolllink2

   function Marquee(){

   if(rolllink2.offsetTop-rolllink.scrollTop<=0) //当滚动至rolllink1与rolllink2交界时

   rolllink.scrollTop-=rolllink1.offsetHeight  //rolllink跳到最顶端

   else{

   rolllink.scrollTop++

   }

   }

   var MyMar=setInterval(Marquee,rollspeed) //设置定时器

   rolllink.onmouseover=function() {clearInterval(MyMar)}//鼠标移上时清除定时器达到滚动停止的目的

   rolllink.onmouseout=function() {MyMar=setInterval(Marquee,rollspeed)}//鼠标移开时重设定时器