// JScript 文件

var Marquee = function(id){
try{document.execCommand("BackgroundImageCache", false, true);}catch(e){};
var container = document.getElementById(id),
slide = container.getElementsByTagName("li")[0],
speed = arguments[1] || 10;
slide.innerHTML += slide.innerHTML;
var item  = slide.getElementsByTagName("a"),
critical = item[item.length/2].offsetLeft,//临界值
delta = 0;
var rolling = function(){
  delta == -critical ? delta = 0 : delta--;
  slide.style.left = delta + "px";
}
var timer = setInterval(rolling,speed)//设置定时器
container.onmouseover=function() {clearInterval(timer)}//鼠标移到marquee上时，清除定时器，停止滚动
container.onmouseout=function() {timer=setInterval(rolling,speed)}//鼠标移开时重设定时器
}