Connecting to remote MySQL Database getting exception from Windows Server 2003

$mysql_hostname = "202.13.4.100:3306";
$mysql_user = "user";
$mysql_password = "123456";
$mysql_database = "db";
$bd = mysql_connect($mysql_hostname, $mysql_user, $mysql_password) 
or die("Opps some thing went wrong Connection");
mysql_select_db($mysql_database, $bd) or die("Opps some thing went wrong Database");