用以下代码.
<script language="JavaScript"><!--
c0off = new Image(80,30); c0off.src = "图片1位置";
c0on = new Image(80,30); c0on.src = "图片2位置";
function img_act(imgName)
{
imgOn = eval(imgName+"on.src");
document[imgName].src = imgOn;
}

function img_inact(imgName)
{
imgOff = eval(imgName+"off.src");
document[imgName].src = imgOff;
}

function erase()
{
window.status="网页教学网";
}

function moveover(txt)
{
window.status=txt;
}
// --></script></p>
<a href=intex.htm
onmouseover="img_act("c0");moveover("图片名");return true;"
onmouseout="img_inact("c0");return true;"><img
src="图片1位置" border="0" width="80" height="30" name="c0"></a>