不知道哪错了，就是运行不出来
window.onload=function(){
var aLi=document.getElementsByTagName('li');
for(var i=0;i<aLi.length;i++){
aLi[i].timer=null;
aLi[i].onmouseover=function(){
startMove(this,400);
}
aLi[i].onmouseout=function(){
startMove(this,200);
}
}
function startMove(obj,iTarget){
clearInterval(obj.timer);
obj.timer=setInterval(function()
{
var speed=(iTarget-obj.offsetWidth)/8;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
if(obj.offsetWidth==iTarget)
{
clearInterval(obj.timer);
}
else{
obj.style.Width=obj.offsetWidth+speed+'px';
}
},10)
}
