(急)打开子页面问题,如何通过点击个人常用短消息和预定发送短消息，MessageBody.aspx得到不同的显示内容？

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main.aspx
<frameset border="0" frameSpacing="0" rows="81%" frameBorder="0">
<frameset cols="20%,80%">
<frame name="frmMessageLeft" src="MessageLeft.aspx">
<frame name="frmMessageBody" src="MessageBody.aspx">
</frameset>
<noframes>
<pre id="p2">
</pre>
<p id="p1">
</p>
</noframes>
</frameset>
---------------------------------------------
MessageLeft.aspx:
<form id="Form1" method="post" runat="server">
<table width="20%">
<tr>
<td>
<DIV id="DIV3" style="DISPLAY: inline; WIDTH: 120px; HEIGHT: 36px" runat="server" ms_positioning="FlowLayout">个人常用短消息</DIV>
</td>
</tr>
<tr>
<td>
<DIV id="DIV4" style="DISPLAY: inline; WIDTH: 120px; HEIGHT: 36px" runat="server" ms_positioning="FlowLayout">预定发送短消息</DIV>
</td>
</tr>
</table>
</form>
----------------------------
MessageBody.aspx中用datagird来显示数据

如何通过点击个人常用短消息和预定发送短消息显示不同的MessageBody.aspx内容？