<DIV onMouseOver="select.style.display='none';" onMouseOut="select.style.display=''">select</DIV>
<select name="select">
<option value="0">请选择</option>
<option value="5">一级</option>
<option value="3">二级</option>
<option value="1.5">三级</option>
<option value="1">四级</option>
</select>
<select name="select">
<option value="0">请选择</option>
<option value="5">一级</option>
<option value="3">二级</option>
<option value="1.5">三级</option>
<option value="1">四级</option>
</select>
<tr>
<td onMouseOver="form1.select.style.display:''" onMouseOut="form1.select.style.display:none">>
<form name="form1" method="post" action="">
<select name="select">
<option value="0">请选择</option>
<option value="5">一级</option>
<option value="3">二级</option>
<option value="1.5">三级</option>
<option value="1">四级</option>
</select>
</form>
</td>
</tr>
</table>
<tr>
<td onMouseOver="form1.select.style.display=''" onMouseOut="form1.select.style.display='none'">
<form name="form1" method="post" action="">
<select name="select">
<option value="0">请选择</option>
<option value="5">一级</option>
<option value="3">二级</option>
<option value="1.5">三级</option>
<option value="1">四级</option>
</select>
</form>
</td>
</tr>
</table>鼠标离开时SELECT就隐藏,就不好再移至SELECT上了
<Span onmouseover="select.style.display='block';" onmouseout="select.style.display='none';">Select
<select id="select" style="display:none">
<option value="0">请选择</option>
<option value="5">一级</option>
<option value="3">二级</option>
<option value="1.5">三级</option>
<option value="1">四级</option>
</select>
</span>
应该把select包含进来