//添加事件响应函数的函数，与本效果无关
function addEventSimple(obj,evt,fn){
 if(obj.addEventListener){
  obj.addEventListener(evt,fn,false);
 }else if(obj.attachEvent){
  obj.attachEvent('on'+evt,fn);
 }
}
addEventSimple(window,'load',initscrolling);
addEventSimple(window,'load',initscrolling1);

//保存想要滚动的容器
var scrollingBox;
var scrollingBox1;
var scrollingInterval;
var scrollingInterval1;
//用于记录是否“滚到头”过一次
var reachedBottom=false;
var reachedBottom1=false;
//记录第一次滚到头时候的scrolltop
var bottom;
var bottom1;
//初始化滚动效果
function initscrolling(){
 scrollingBox = document.getElementById("scrollText");
 //样式设置，与滚动基本无关，应该用css设置。
 scrollingBox.style.height = "300px";
 scrollingBox.style.overflow = "hidden";
 //滚动
 scrollingInterval = setInterval("scrolling()",90);

 //鼠标划过停止滚动效果
 scrollingBox.onmouseover = over;
 //鼠标划出回复滚动效果
 scrollingBox.onmouseout = out; 
}
function initscrolling1(){
 scrollingBox1 = document.getElementById("scrollText1");
 //样式设置，与滚动基本无关，应该用css设置。
 scrollingBox1.style.height = "300px";
 scrollingBox1.style.overflow = "hidden";
 //滚动
 scrollingInterval1 = setInterval("scrolling1()",70);
 //鼠标划过停止滚动效果
 scrollingBox1.onmouseover = over;
 //鼠标划出回复滚动效果
 scrollingBox1.onmouseout = out; 
}
//滚动效果
function scrolling(){
 //开始滚动,origin是原来scrollTop
 var origin = scrollingBox.scrollTop++;
 //如果到头了
 if(origin == scrollingBox.scrollTop){
  //如果是第一次到头
  if(!reachedBottom){
   scrollingBox.innerHTML+=scrollingBox.innerHTML;
   reachedBottom=true;
   bottom=origin;
  }else{
   //已经到头过，只需回复头接尾的效果
   scrollingBox.scrollTop=bottom;
  }
 }
}

function scrolling1(){
 //开始滚动,origin是原来scrollTop
 var origin1 = scrollingBox1.scrollTop++;
 //如果到头了
 if(origin1 == scrollingBox1.scrollTop){
  //如果是第一次到头
  if(!reachedBottom1){
   scrollingBox1.innerHTML+=scrollingBox1.innerHTML;
   reachedBottom1=true;
   bottom1=origin1;
  }else{
   //已经到头过，只需回复头接尾的效果
   scrollingBox1.scrollTop=bottom1;
  }
 }
}
function over(){
 clearInterval(scrollingInterval);
 clearInterval(scrollingInterval1);
}
function out(){
 scrollingInterval = setInterval("scrolling()",90);
scrollingInterval1 = setInterval("scrolling1()",70);
}