//添加事件响应函数的函数，与本效果无关
 
//保存想要滚动的容器
var scrollingBox2;
var scrollingInterval2;
//用于记录是否“滚到头”过一次
var reachedBottom2=false;
//记录第一次滚到头时候的scrollTop
var bottom2;
//初始化滚动效果
function initScrolling2(vSId){
 scrollingBox2 = document.getElementById(vSId);
 //样式设置，与滚动基本无关，应该用CSS设置。
 scrollingBox2.style.height = "220px";
 scrollingBox2.style.overflow = "hidden";
 //滚动
 scrollingInterval2 = setInterval("scrolling2()",50);
 //鼠标划过停止滚动效果
 scrollingBox2.onmouseover = over2;
 //鼠标划出回复滚动效果
 scrollingBox2.onmouseout = out2; 
}
//滚动效果
function scrolling2(){
 //开始滚动,origin是原来scrollTop
 var origin = scrollingBox2.scrollTop++;
 //如果到头了
 if(origin == scrollingBox2.scrollTop){
  //如果是第一次到头
  if(!reachedBottom2){
   scrollingBox2.innerHTML+=scrollingBox2.innerHTML;
   reachedBottom2=true;
   bottom2=origin;
  }else{
   //已经到头过，只需回复头接尾的效果
   scrollingBox2.scrollTop=bottom2;
  }
 }
}
function over2(){
 clearInterval(scrollingInterval2);
}
function out2(){
 scrollingInterval2 = setInterval("scrolling2()",50);
}
// JavaScript Document// JavaScript Document