รบกวนด้วยครับ ใช้ Windows7 กับ Appserv รู้สึกจะมีปัญหาเวลา Connect เชื่อมต่อ Database

<?php
session_start();
if ($_POST['op'] != "ds") {
...
...
}
?>

<?php

$host = "localhost" ;

$username = "root" ;	//Temp Server
$password = "xxxx" ;
$db = "xxxx_data" ;

//$username = "xxxx_admin" ;	//Real Server
//$password = "xxxx" ;
//$db = "xxxx_data" ;

$objConnect = mysql_connect( $host,$username,$password) or die ("Can not connect to Mysql");
//mysql_select_db($db) or die("can not select database"); 
$objDB = mysql_select_db($db) or die("can not select database"); 

//mysql_db_query($db,"SET NAMES tis620");
mysql_db_query($db,"SET NAMES utf8");

?>