csv download issue

I am have written the following script to download results from my mysql query to csv. The code

define(db_host, "localhost");
define(db_user, "username");
define(db_pass, "passwd");
define(db_link, mysql_connect(db_host,db_user,db_pass));
define(db_name, "db_name");
mysql_select_db(db_name);

$select = "SELECT m.mail_email,t.mail_type FROM mailing AS m, mail_type AS t WHERE m.mail_type=t.type_id ORDER BY m.mail_type ASC";                
$export = mysql_query($select);
$fields = mysql_num_fields($export);

for ($j = 0; $j < $fields; $j++) {
    $header .= mysql_field_name($export, $j) . "\t";
}
while($row = mysql_fetch_row($export)) {
    $line = '';
    foreach($row as $value) {                                            
        if ((!isset($value)) OR ($value == "")) {
            $value = "\t";
        } else {
            $value = str_replace('"', '""', $value);
            $value = '"' . $value . '"' . "\t";
        }
        $line .= $value;
    }
    $data .= trim($line)."\n";
}
$data = str_replace("\r","",$data);

if ($data == "") {
    $data = "\n(0) Records Found!\n";                        
}

header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=emails.xls");
header("Pragma: no-cache");
header("Expires: 0");
print "$header\n$data";

This code dumps out the results which is perfect but now I want the results to start from the second row and the first row to have prefilled column name --- Email Address (column 1), Type (column 2). I will really appreciate it someone can tweak my code to allow for this functionality. Thanks

Sulen