为什么这个由链接触发的翻转器不起作用，路过的帮忙看看，谢谢

window.onload=init;

function init(){

for(var i=0;i<document.links.length;i++)

var linkobj=links[i];

if(linkobj.id){

var imgobj=document.getElementById(linkobj.id+"img");

}

if(imgobj){

rollOver(linkobj,imgobj);

}

function rollOver(thisLink,thisImage){

thisLink.imgToChange=thisImage;

thisLink.onmouseout=function(){

this.imgToChange.src=this.outImage.src;

}

thisLink.onmouseover=function(){

this.imgToChange.src=this.overImage.src;

}

thisLink.outImage=new Image();

thisLink.outImage.src=thisImage.src;

thisLink.overImage=new Image();

thisLink.overImage.src="images/"+thisLink.id+".jpg";

}

补充html如下：

<body>

<a href="#" id="hai">这是一个超链接</a>

</body>

慕粉4240002

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