มันขึ้น error ติดต่อ db ไม่ได้ค่ะ Warning mysql_connect() [function.mysql-connect]: Host 'svr-ad02.bisphuket.ac.t

<?php
header('Content-type: application/csv');
header('Content-Disposition: attachment; filename="registration..Term 3...csv"'); 
$host="svr-ad02";
$username="root";
$password="123456";
$db="activity_db";
$tb="regis3";
mysql_connect( $host,$username,$password) or die ("µÔ´µè͡Ѻ°Ò¹¢éÍÁÙÅ Mysql äÁèä´é ");
mysql_select_db($db) or die("àÅ×Í¡°Ò¹¢éÍÁÙÅäÁèä´é"); 

echo "No.,Home,Title,Fname,Lname,Username,Year,Class,Thai Cultural,M1,M2,M3,Mpaid,T1,T2,T3,Tpaid,Wpaid,Th Colour Team,Thpaid,F,Fpaid\n"; 
$sql = "SELECT * FROM regis3";
$dbquery = mysql_query($sql);
$num_rows = mysql_num_rows($dbquery);
//$nums_rows = mysql_affected_rows(); // ¨Ó¹Ç¹àá¤ÍÃ촢ͧ¹Ñ¡àÃÕ¹·Ñé§ËÁ´

$i=0;
while ($i < $num_rows)
{
$result= mysql_fetch_array($dbquery);


echo "$result[ID],$result[home],$result[tle],$result[Fname],$result[Lname],$result[usernm],$result[Year],$result[cls],$result[CUL],$result[M1],$result[M2],$result[M3],$result[Mpaid],$result[T1],$result[T2],$result[T3],$result[Tpaid],$result[Wpaid],$result[Th],$result[Thpaid],$result[F],$result[Fpaid]\n";

$i++;
} 
?>