各位大神们，帮忙看看

window.onload=function(){

var Li1=document.getElementById('li1');

var Li2=document.getElementById('li2');

var Li1.timer=null;

var Li2.timer=null;

Li1.onmouseover=function(){

startMove(this,'height',400)

}

Li1.onmouseout=function(){

startMove(this,'height',100)

}

Li2.onmouseover=function(){

startMove(this,'width',400)

}

Li2.onmouseout=function(){

startMove(this,'width',200)

}

}

function getStyle(obj,attr)

{

if(obj.currentStyle){return obj.currentStyle[attr];}

else{return getComputedStyle(obj,false)[attr];}

}

function startMove(obj,attr,iTarget){

var icur=parseInt(getStyle(obj,attr));

clearInterval(obj.timer);

obj.timer=setInterval(function(){

var speed=(iTarget-icur)/8;

speed=speed>0?Math.ceil(speed):Math.floor(speed);

if(icur==iTarget){clearInterval(obj.timer);}

else{obj.style[attr]= icur + speed +'px';}

},30);

}

第三行第四行定义初始化了两个timer为啥就不能动了，还有缓冲效果怎么出不来，speed/8的时候效果不对，去掉除以8不能缓冲了，怎么回事呀