例:
<table>
<tr>
<td title="添加鼠标悬浮" ><input value="添加鼠标悬浮" onmouseover="over(this)"/></td>
</tr>
</table>
<script>
function over(value) {
$(value).parent().attr("title", $(value).parent().context.defaultValue);
$(value).parent().css("cursor", 'pointer');
}
</script>