添加评论和查看评论的话，主要在于是在不同的表插入，然后该传递的值是不是用post的方式或者get的方式传递了。
添加：
<!--reply.php:回复留言信息--------------->
<?
require_once("sys_conf.inc");
//判断姓名和留言信息是否为空
$errorm="";
if(isset($_POST["name"]))
{
if ($_POST["message"]=="" || $_POST["name"]=="")
{
$errorm="<font color=red>出错了!!!</font>姓名和留言内容必填";
}
else
{
//连接数据库
$link_id=mysql_connect($DBHOST,$DBUSER,$DBPWD);
mysql_select_db($DBNAME); //选择数据库my_chat
$bookid=$_POST["recordid"];
$message = $_POST['message'];
$name = $_POST['name'];
$homepage = $_POST['homepage'];
$email = $_POST['email'];
$location = $_POST['location'];
$space = " ";
$time = date("Y年m月d日H小时i分");
$ip=$_SERVER["REMOTE_ADDR"];
$message=StripSlashes($_POST["message"]); //给字符串中按照需要加上""和去掉""，对于某些数据库，必须在要查询的字符加上和去掉""之后才能够查询.
$message=htmlspecialchars($message); //将HTML特殊字符换成它们的名字,例如"<"变成"<".
$message=nl2br($message); //在HTML中的每一个回车前面加上"<BR>".
$guestcontent = "<tr><td><font color=#AB00E1>回复内容:</font><br>$message";
$guestcontent=$guestcontent."<br><font color=#6633FF>回复人大名: </font>".$_POST["name"];
if ($_POST["email"] !="")
$guestcontent=$guestcontent."<br><font color=#9900CC>电子信箱:</font><a href="mailto:".$_POST["email"]."">".$_POST["email"]."</a>"."$space";
if ($_POST["homepage"] !="http://")
$guestcontent=$guestcontent."<font color=#9900CC>主页:</font><a href="$homepage">$homepage</a>";
if ($_POST["location"] !="")
$guestcontent=$guestcontent."<br><font color=#0000FF>时间:".$time." 来自:".$_POST["location"]." $ip</font>";
$guestcontent=ereg_replace(chr(10),"",$guestcontent);
$guestcontent=$guestcontent."<hr size=1></td></tr>
";
//插入数据
$str="insert into reply (replyid,bookid,time,ip,name,homepage,location,email,message,content,is_delete)";
$str=$str."values($bookid,$bookid,'$time','$ip','".$_POST["name"]."','".$_POST["homepage"]."','".$_POST["location"]."','".$_POST["email"]."','".$_POST["message"]."','".$guestcontent."','n')";
//echo $str;
$result=mysql_query($str); //执行查询
mysql_close($link_id);
echo "<script language='javascript'>";
echo " location='booklist.php?keyword=&search=1'";
echo "</script>";
}
}
?>
<title>回复留言</title>
<style>
<!--
A:link {text-decoration: none ; color:#0000ff}
A:visited {text-decoration: none; color:#004080}
A:active {text-decoration: none}
A:hover {text-decoration: underline; color:#ff0000}
BODY {FONT-SIZE: 10pt}
TH {FONT-SIZE: 10pt}
TD {FONT-SIZE: 10pt}
-->
</style>
<body bgcolor="#FFFFFF" background="back.gif">
<?php include "head.html"?>
<div align=center >
<table border= 1 width= 65% height= 169 cellpadding="8" cellspacing="0" bordercolor="#E3E3E3" >
<form method="POST" action="reply.php">
<?
if (isset($_POST['ok']) )
{
if ($_POST['name']=="" or $_POST['message']=="")
{
echo"<tr align=left valign=middle bgcolor=#F0F0F0> ";
echo"<td width= 100% height= 31 > ";
echo "<font color=red>出错了</font>回复人姓名和回复内容必填!";
echo"</td>";
echo"</tr>";
}
}
?>
<tr>
<td width="22%" bgcolor="#F0F0F0"><font color="#000000">姓名<font color="#FF0033">(必填)</font></font></td>
<td colspan="2" width="78%" bgcolor="#F0F0F0"><font color="#00FF00">
<input type="text" name="name" size="40">
</font></td>
</tr>
<tr>
<td width="22%" height="29">主页:</td>
<td colspan="2" height="29" width="78%">
<input type="text" name="homepage" size="40" value="http://">
</td>
</tr>
<tr>
<td width="22%" height="27" bgcolor="#F0F0F0">来自:</td>
<td colspan="2" height="27" width="78%" bgcolor="#F0F0F0">
<input type="text" name="location" size=40">
</td>
</tr>
<tr>
<td width="22%" height="20">Email:</td>
<td colspan="2" height="20" width="78%"><font color="#00FF00">
<input type="text" name="email" size="40">
</font></td>
</tr>
<tr>
<td colspan="3" valign="middle" align="left">
<div align="center"><font color="#000000">请回复</font><font color="#FF0033">(必填)</font><font color="#00FF00"><br>
<textarea rows="6" name="message" cols="55" wrap="VIRTUAL"></textarea>
</font></div>
</td>
</tr>
<tr bgcolor="#F0F0F0">
<td colspan="3" height="24">
<div align="center"><font color="#00FF00">
<input type=hidden value=<?php if(isset($_GET["recordid"])) echo $_GET["recordid"];?> name=recordid>
<input type="submit" value="提 交" name="ok">
<input type="reset" value="重 写" name="cencel">
</font></div>
</td>
</tr>
</form>
</table>
</div>
</body>
</html> then 评论列表：
<!--replylist.php:查看回复--------------------->
<?php
require_once("sys_conf.inc");
//初始化
$one_page_line=10; //每页的最大记录数
$reply_content=array(); //数组，包含所有记录的content属性内容
//查询数据库，获取$content值
$link_id=mysql_connect($DBHOST,$DBUSER,$DBPWD);
mysql_select_db($DBNAME);
$str="select content from reply where bookid =".$_GET["recordid"];
$result=mysql_query($str,$link_id);
//循环将数据库中值写入数组
$i=0;
while(list($con)=mysql_fetch_row($result))
{
$reply_content[$i]=$con;
$i++;
}
mysql_close($link_id);
$count =count($reply_content);
?>
<html>
<head>
<title>查看回复</title>
</head>
<body>
<?php include "head.html"?>
<table width="68%" border="0">
<tr>
<td>
<?php
$int_page_count=$count; //总条数;
$int_page_num=ceil($int_page_count/$one_page_line);//总页数;
echo "<font color=#CC33FF>分页:";
for ($i=1;$i<=$int_page_num;$i++)
{
echo "<a href=booklist.php?recordid=".$_GET["recordid"]."&page=$i>".$i."</a> ";
}
echo "</font>";
?>
</td>
<td><p align=right>共有<font color=red><?echo "$count"?></font>条</p></td>
</tr>
</table>
<table width="68%" border="0" align="center">
<?
if (!isset($_GET['page']))
$page=1;
else
$page=$_GET['page'];
$text="";
$begin_line=$int_page_count-($page-1)*$one_page_line;
if ($begin_line<$one_page_line)
$one_page_line=$begin_line;
for ($j=$begin_line;$j>($begin_line-$one_page_line);$j--)
{
print_r ($reply_content[$j-1]);
}
?>
</table>
<p align=center><a href="#" onclick=history.back()>返 回</a></p>
</body>
</html>