鼠标悬停换图片或背景

鼠标悬停换图片或背景

<script language="javascript">
function over(id){
document.getElementById(id).style.background='url(images/'+id+'on.jpg) center no-repeat';
}

function out(id){
document.getElementById(id).style.background='url(images/'+id+'off.jpg) center no-repeat';
}
</script>
<table width="100%" height="100%" border="0" cellspacing="0" cellpadding="0">
    <tr>
      <td height="23" align="center" id="click_" style="background:url(images/click_off.jpg) center no-repeat;"><a href="case.html" class="cWhite" onmousemove="over('click_')" onmouseout="out('click_')">点 击 进 入</a></td>
    </tr>
</table>

<script language="javascript">
function over(id){
document.getElementById(id).src="images/"+id+"on.jpg";
}

function out(id){
document.getElementById(id).src="images/"+id+"off.jpg";
}
</script>
<img src="images/download_off.jpg" width="220" height="51" alt="资料下载" id="download_" onmousemove="over('download_')" onmouseout="out('download_')" />