用什么属性取得div内的所有html内容。

我为你改好了，你看看吧：
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title>New Page 1</title>
</head><body>
<script language="javascript">
var optionalMessage;
function switchOptionalMessage(divOptionalMessageID,divOptionalMessageTitleID)
{
if(document.all[divOptionalMessageID].visibility=="show")
{
document.all[divOptionalMessageID].visibility="hide";
optionalMessage=document.all[divOptionalMessageID].innerHTML;
document.all[divOptionalMessageID].innerHTML="";
document.all[divOptionalMessageTitleID].innerText="显示可选信息";
}
else
{
document.all[divOptionalMessageID].visibility="show";
document.all[divOptionalMessageID].innerHTML=document.all[divOptionalMessageTitleID].innerText;
document.all[divOptionalMessageTitleID].innerText="隐藏可选信息";
}
}
</script>
<table>
<tr height="50">
<td colspan="2">
<div class="itemTitle" id="divOptionalMessageTitle" onclick='switchOptionalMessage("divOptionalMessage","divOptionalMessageTitle")'>显示可选信息</div>
</td>
</tr>
<div id="divOptionalMessage" style="VISIBILITY: visible">
<tr>
<td>dddddddddd</td>
</tr>
</div>
</table>
</body></html>