要传递一个图片的name值。因为要放很多超链接的图片
<a href="" onmouseover="aaa('index1')" onmouseout="bbb('index2')"> <img name="index" src="img/index.jpg"/></a>
<a href="" onmouseover="aaa('index1')" onmouseout="bbb('index2')"> <img name="index" src="img/index.jpg"/></a>
function change(img,bool)
{
if(bool)
img.src = img.title+"On.png";
else
img.src = img.title+"Out.png";
}<img onMouseOver="change(this,true)" onMouseOut="change(this,false)" title="index" src="indexOut.png">
<img onMouseOver="change(this,true)" onMouseOut="change(this,false)" title="home" src="homeOut.png">