自动上下循环图片怎么制作呢

水色麦田

请教自动上下循环图片怎么制作呢？

一壶浊酒

<div id=demo_t0 style=overflow:hidden;height:340px onmouseover="demo_ti=1" onmouseout="demo_ti=0">
<div id=demo_t1>
   <img src='你图片的路径'>
</div>
<div id=demo_t2></div>   
<script>
var demo_ti=0;
demo_t2.innerHTML=demo_t1.innerHTML
function demo_Marquee(){
  if (demo_ti==1)return
  if(demo_t2.offsetTop-demo_t0.scrollTop<=0)
    demo_t0.scrollTop-=demo_t1.offsetHeight
  else
    demo_t0.scrollTop++
}
setInterval(demo_Marquee,50)
</script>
</div>