IE下改透明度没反应。。。是哪里错了吗？

Question

<script>
function getStyle(obj,name){
	if(obj.currenStyle){
		return obj.currtnStyle[name];
 }else{
		return getComputedStyle(obj,false)[name];
	}	
}
function startMove(obj,attr,iTaret){
	clearInterval(obj.timer);
	obj.timer=setInterval(function(){
		var cur=0;
		if(attr="opacity"){
			cur=parseFloat(getStyle(obj,attr))*100;
			}else{
				cur=parseInt(getStyle(obj,attr))
		};
		var speed=(iTaret-cur)/6;
		speed=speed>0?Math.ceil(speed):Math.floor(speed);
		if(cur==iTaret){
			clearInterval(obj.timer);
			}else{
				if(attr=="opacity"){
					obj.style.filter='alpha(opacity='+(cur+speed)+')';
					obj.style.opacity=(cur+speed)/100;
					}else{
						obj.style[attr]=cur+speed+'px';}
					}
		},30)
	}
	
window.onload=function(){
	var oDiv=document.getElementsByTagName('div');
	for(var i=0;i<oDiv.length;i++){
		oDiv[i].timer=i;
		oDiv[i].onmouseover=function(){
			startMove(this,'width',400);
			}
		oDiv[i].onmouseout=function(){
			startMove(this,'width',100);
		}
		}
	}	

</script>

Answer 1

贴完整代码。。。我不想一行一行去看。