请问在下面的的代码中如何修改可以实现点击后改变图片吗？还请各位大师多多指教，拜拖哪.... - 调试易

请问在下面的的代码中如何修改可以实现点击后改变图片吗？还请各位大师多多指教，拜拖哪....

<link rel="stylesheet" type="text/css" href="css.css">
<base target="right">
<style type="text/css">

</style>
<script language="javascript">
function showdiv(div_id,img_i)
{
if(document.all.item(div_id).style.display=="block")
  {
     document.all.item(div_id).style.display="none";
img_i.src="pic/P1.gif";
return true;
  }
else
  {
     document.all.item(div_id).style.display="block";
img_i.src="pic/M1.gif";
return true;
  }
  return false;
}
</script>
<body>
<table border='1' cellpadding='0' cellspacing='0' style='border-collapse: collapse' bordercolor='#FF9900' width="95%">
  <tr>
    <td width="100%" height="28" align="center" bgcolor="#FFFF00">
    <a href="index.asp" target="_top" class="STYLE1">     <b> 返回论坛首页</b></a></td>
  </tr>
</table><table border='0' cellpadding='0' cellspacing='0' style='border-collapse: collapse' bordercolor='#FF9900' width="95%" >
<tr>
<td height="1px"> </td>
</tr>
</table><table border='1' cellpadding='0' cellspacing='0' style='border-collapse: collapse' bordercolor='#FF9900' width="95%" >  <tr>
    <td height="22" bgcolor="#FFFF00">    <font color="#FFFFFF"><b> <img src="pic/P1.gif" alt="点击下拉" width="20" height="20" align="absmiddle"  language="javascript" onClick="showdiv('div2',this);" name="img2" id="img2"> <span class="STYLE1">论坛管理</span></b></font>    </td>
  </tr>
</table>
<div id="div2" style="display:none">
<table border='1' cellpadding='0' cellspacing='0' style='border-collapse: collapse' bordercolor='#FF9900' width="95%"  height="9">
  <tr>
    <td width="100%" height="26" nowrap="nowrap">   |-
    <a href="admin-right.asp?action=addfl" >添加论坛分类</a></td>
  </tr>
  <tr>
    <td width="100%" height="26" nowrap="nowrap">    |-
    <a href="admin-gl.asp?menu=addbbs">论坛添加</a>·<a href="admin-gl.asp?menu=bbsgl">管理</a>　</td>
  </tr>
  <tr>
    <td width="100%" height="26" nowrap="nowrap">    |-
    <a href="admin-right.asp?action=bzgl&bz=add">版主添加</a>·<a href="admin-right.asp?action=bzgl&bz=del">删除</a></td>
  </tr>
  <tr>
    <td width="100%" height="26" nowrap="nowrap">   |-
    <a href="admin-right.asp?action=lm">论坛联盟管理</a></td>
  </tr>
  <tr>
    <td width="100%" height="26" nowrap="nowrap">   |-
    <a href="admin-right.asp?action=chadmin">编辑管理员</a></td>
  </tr>
</table></div><table border='1' cellpadding='0' cellspacing='0' style='border-collapse: collapse' bordercolor='#FF9900' width="95%" >  <tr>
    <td height="22" bgcolor="#FFFF00">    <font color="#FFFFFF"><b> <img src="pic/P1.gif" alt="点击下拉" width="20" height="20" align="absmiddle"  language="javascript" onClick="showdiv('div3',this);" name="img3" id="img3"> <span class="STYLE1">用户管理</span></b></font>    </td>
  </tr>
</table>
<div id="div3" style="display:none">
<table border='1' cellpadding='0' cellspacing='0' style='border-collapse: collapse' bordercolor='#FF9900' width="95%" >
  <tr>
    <td width="100%" height="26" nowrap="nowrap">   |-
    <a href="admin-right.asp?action=deluser">删除用户</a></td>
  </tr>
  <tr>
    <td width="100%" height="26" nowrap="nowrap">   |-
    <a href="admin-right.asp?action=lookuser">查看注册用户</a>　</td>
  </tr>
  <tr>
    <td width="100%" height="26" nowrap="nowrap">    |-
    <a href="admin-right.asp?action=updateuser">更改用户资料</a></td>
  </tr>
  <tr>
    <td width="100%" height="26" nowrap="nowrap">    |-
    <a href="admin-right.asp?action=seepwd">查看用户密码</a></td>
  </tr>
</table></div><table border='1' cellpadding='0' cellspacing='0' style='border-collapse: collapse' bordercolor='#FF9900' width="95%" >
  <tr>
    <td height="22" bgcolor="#FFFF00">    <font color="#FFFFFF"><b> <img src="pic/P1.gif" alt="点击下拉" width="20" height="20" align="absmiddle"  language="javascript" onClick="showdiv('div4',this);" name="img4" id="img4"> <span class="STYLE1">帖子管理</span></b></font>    </td>
  </tr>
</table>
<div id="div4" style="display:none">
<table border='1' cellpadding='0' cellspacing='0' style='border-collapse: collapse' bordercolor='#FF9900' width="95%"  height="9">
  <tr>
    <td width="100%" height="26" nowrap="nowrap">    |-
    <a href="admin-right.asp?action=delany">批量删除帖子</a></td>
  </tr>
  <tr>
    <td width="100%" height="26" nowrap="nowrap">    |-
    <a href="admin-right.asp?action=moveany">批量移动帖子</a></td>
  </tr>
</table></div><table border='1' cellpadding='0' cellspacing='0' style='border-collapse: collapse' bordercolor='#FF9900' width="95%" >
  <tr>
    <td height="22" bgcolor="#FFFF00">    <font color="#FFFFFF"><b> <img src="pic/P1.gif" alt="点击下拉" width="20" height="20" align="absmiddle"  language="javascript" onClick="showdiv('div5',this);" name="img5" id="img5"> <span class="STYLE1">论坛其它</span></b></font>    </td>
  </tr>
</table>
<div id="div5" style="display:none">
<table border='1' cellpadding='0' cellspacing='0' style='border-collapse: collapse' bordercolor='#FF9900' width="95%"  height="9">
  <tr>
    <td width="100%" height="26" nowrap="nowrap">   |-
    <a href="admin-right.asp?action=bbs">修改名称及其他</a></td>
  </tr>
  <tr>
    <td width="100%" height="26" nowrap="nowrap">    |-
    <a href="admin-right.asp?action=bbsmail">论坛留言管理</a></td>
  </tr>
</table></div><table border='1' cellpadding='0' cellspacing='0' style='border-collapse: collapse' bordercolor='#FF9900' width="95%" >
  <tr>
    <td height="22" bgcolor="#FFFF00">    <font color="#FFFFFF"><b> <img src="pic/P1.gif" alt="点击下拉" width="20" height="20" align="absmiddle"  language="javascript" onClick="showdiv('div6',this);" name="img6" id="img6"> </b></font><b><span class="STYLE1">数据处理</span></b> </td>
  </tr>
</table>
<div id="div6" style="display:none">
<table border='1' cellpadding='0' cellspacing='0' style='border-collapse: collapse' bordercolor='#FF9900' width="95%"  height="9">
  <tr>
    <td width="100%" height="26" nowrap="nowrap">    |-
    <a href="mdbcon.asp">数据库操作</a></td>
  </tr>
</table></div>

解决方案 »

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wxylvmnn您好！请问showdiv('div2',this)和showdiv('div2','img2')有什么区别啊？为什么前者可以实现图片互换，而后者不能呢？可以解释一下吗
'img2'是个字符串，不是一个对象。img2才是对象。