mysql_select_db not working

I have a page, index.php, that includes a function.php file at the beginning which contains the following two functions

function g_db_connect($server = DB_SERVER, $username = DB_SERVER_USERNAME, $password = DB_SERVER_PASSWORD, $database = DB_DATABASE, $link = 'db_link') {
   global $$link;

   if(USE_PCONNECT == 'true') {
      $$link = mysql_pconnect($server, $username, $password);
   } else {
      $$link = mysql_connect($server, $username, $password);
   }

   if ($$link) mysql_select_db($database);

   return $$link;
}

function g_db_query($query, $link = 'db_link') {
   global $$link;

   if(defined('STORE_DB_TRANSACTIONS') && (STORE_DB_TRANSACTIONS == 'true')) {
      error_log('QUERY ' . $query . "\n", 3, STORE_PAGE_PARSE_TIME_LOG);
   }

   $result = mysql_query($query, $$link) or g_db_error($query, mysql_errno(), mysql_error());

   if(defined('STORE_DB_TRANSACTIONS') && (STORE_DB_TRANSACTIONS == 'true')) {
      $result_error = mysql_error();
      error_log('RESULT ' . $result . ' ' . $result_error . "\n", 3, STORE_PAGE_PARSE_TIME_LOG);
   }

   return $result;
}

Code (markup):

The page itself contains the code

g_db_connect() or die('Could not connect to the Database');

$manu_sql    = 'SELECT * FROM '.TABLE_PREFIX.'manu';
$manu_query  = g_db_query($manu_sql);

Code (markup):

But when I try to access the page I get the error message 1046 - No database selected
Why isn't it selecting the database? I've verified that the constants contain the values they are supposed to contain.

 

Add following line;

define( 'DB_DATABASE', 'YOUR DATABASE NAME HERE');

Code (markup):

(replace YOUR DATABASE NAME HERE with your actual mysql database name)

_before_ calling following line;

g_db_connect() or die('Could not connect to the Database');

Code (markup):

 

great kelly

 

I have do my custom db.class.php check this out