Have you recently edited any of these files?

When entering guestbook following error appears at the top:

Parse error: parse error, unexpected '&', expecting T_STRING or T_VARIABLE or '{' or '$' in /home/turtlesj/public_html/dirtydolls/guestbook/lib/mysql.class.php on line 20

Surely the title of this thread answers your problem

can help me to edit for error
Parse error: parse error, unexpected '&', expecting T_STRING or T_VARIABLE or '{' or '$' in /home/turtlesj/public_html/dirtydolls/guestbook/lib/mysql.class.php on line 20

this error in my guestbook
code:
Parse error: parse error, unexpected '&', expecting T_STRING or T_VARIABLE or '{' or '$' in /home/turtlesj/public_html/dirtydolls/guestbook/lib/mysql.class.php on line 20

Below is a copy of my my sql class file
code:
<?php
/**
* ----------------------------------------------
* Advanced Guestbook 2.3.1 (PHP/MySQL)
* Copyright (c)2001 Chi Kien Uong
* URL: http://www.proxy2.de
* ----------------------------------------------
*/

class gbook_sql {

var $conn_id;
var $result;
var $record;
var $db = array();
var $port;

function gbook_sql() {
global $GB_DB;
$this->db =& $GB_DB;
if(ereg(":",$this->db['host'])) {
list($host,$port) = explode(":",$this->db['host']);
$this->port = $port;
} else {
$this->port = 3306;
}
}

function connect() {
$this->conn_id = mysql_connect($this->db['host'].":".$this->port,$this->db['user'],$this->db['pass']);
if ($this->conn_id == 0) {
$this->sql_error("Connection Error");
}
if (!mysql_select_db($this->db['dbName'], $this->conn_id)) {
$this->sql_error("Database Error");
}
return $this->conn_id;
}

function query($query_string) {
$this->result = mysql_query($query_string,$this->conn_id);
if (!$this->result) {
$this->sql_error("Query Error");
}
return $this->result;
}

function fetch_array($query_id) {
$this->record = mysql_fetch_array($query_id,MYSQL_ASSOC);
return $this->record;
}

function num_rows($query_id) {
return ($query_id) ? mysql_num_rows($query_id) : 0;
}

function num_fields($query_id) {
return ($query_id) ? mysql_num_fields($query_id) : 0;
}

function free_result($query_id) {
return mysql_free_result($query_id);
}

function affected_rows() {
return mysql_affected_rows($this->conn_id);
}

function close_db() {
if($this->conn_id) {
return mysql_close($this->conn_id);
} else {
return false;
}
}

function sql_error($message) {
global $TEC_MAIL;
$description = mysql_error();
$number = mysql_errno();
$error ="MySQL Error : $message\n";
$error.="Error Number: $number $description\n";
$error.="Date : ".date("D, F j, Y H:i:s")."\n";
$error.="IP : ".getenv("REMOTE_ADDR")."\n";
$error.="Browser : ".getenv("HTTP_USER_AGENT")."\n";
$error.="Referer : ".getenv("HTTP_REFERER")."\n";
$error.="PHP Version : ".PHP_VERSION."\n";
$error.="OS : ".PHP_OS."\n";
$error.="Server : ".getenv("SERVER_SOFTWARE")."\n";
$error.="Server Name : ".getenv("SERVER_NAME")."\n";
echo "<b><font size=4 face=Arial>$message</font></b><hr>";
echo "<pre>$error</pre>";
if (eregi("^[_a-z0-9-]+(\\.[_a-z0-9-]+)*@([0-9a-z][0-9a-z-]*[0-9a-z]\\.)+[a-z]{2,5}$", $TEC_MAIL) ) {
$headers = "From: ".$this->db['user']."@".$this->db['host']."\nX-Mailer: Advanced Guestbook 2";
// @mail("$TEC_MAIL","Guestbook - Error","$error","$headers");
}
exit();
}

}

?>

The line in question is $this->db =& $GB_DB;. I'll look into it when I get home.

yes , the line is $this->db =& $GB_DB; , why about line is error, please give me to answer ?

The code is correct. It's a check. Did you make any changes just before this happened?

no, i'm not a change the code.

The you posted file is correct. Check the database information in the config.inc.php file.