Very Urgent, Help Appreciated!

[Minolwen]

http://www.merkamericaco.com/ is the full address.

http://merkamericaco.com/ results in an odd error.

Once you hit "Buy Now" on any product you get the following:

Headers sent in file: /home/merkamericaco/public_html/index.php on line: 1

Here is the code:

<?php

/**
 * define path to application files
 */
define( 'APPS_FILES', '../apps_files' );

require APPS_FILES . '/config/config.php';

require APPS_FILES . '/init.php';

RPC_Db::addConnection( 'default', $config['database']['default'] );

RPC_Registry::set( 'config', $config );

$router = new RPC_Controller_Router_Rewrite();

$http_host = explode( '.', $_SERVER['HTTP_HOST'] );

if( $_SERVER['SERVER_PORT'] != '443' )
{
    if( $http_host[0] != 'secure' && substr( $_SERVER['SERVER_NAME'], 0, 3 ) != 'www' )
    {
        header( 'Location: http://www.' . $_SERVER['SERVER_NAME'] . '' . @$_SERVER['REQUEST_URI'] );
        exit;
    }
}

if( $http_host[0] == 'secure' )
{
    if( $_SERVER['SERVER_PORT'] != '443' )
    {
        header( 'Location: ' . WEB_ADDRESS );
        exit;
    }
    $url = $_SERVER['REQUEST_URI'];
    if( trim( $url, '/' ) != 'checkout/payment' &&
        trim( $url, '/' ) != 'g/callback' &&
        trim( $url, '/' ) != 'checkout/index' &&
        trim( $url, '/' ) != 'checkout/data' &&
        trim( $url, '/' ) != 'checkout/login' &&
        trim( $url, '/' ) != 'checkout/register' &&
        trim( $url, '/' ) != 'checkout/finish' )
    {
        header( 'Location: ' . WEB_ADDRESS . '/' . trim( $url, '/' ) );    
        exit;
    }
}
else
{
    if( $_SERVER['SERVER_PORT'] == '443' )
    {
        header( 'Location: ' . WEB_ADDRESS );
        exit;
    }

    $router->rewrite( '^([a-zA-Z0-9\-\_]+)\/c([0-9]+)$', '/category/index/params/id/$2' );
    $router->rewrite( '^([a-zA-Z0-9\-\_]+)\/p([0-9]+)$', '/product/index/params/id/$2' );
    $router->rewrite( '^([a-zA-Z0-9\-\_]+)\/o([0-9]+)$', '/product/offer/params/id/$2' );
    $router->rewrite( '^page\/([a-zA-Z0-9\-]+)$', '/page/view/params/url/$1' );
    $router->rewrite( '^admin$', '/admin/auth/login', true );
}

$dispatcher = new RPC_Controller_Dispatcher( PATH_ROOT . DS . 'application' . DS . 'controllers' );

$front = new RPC_Controller_Front( $dispatcher, $router );
try { $front->dispatch(); }
catch( Exception $e ) { if( strpos( $e->getMessage(), 'does not exist' ) !== false ) { header( 'Location: /page_not_found.html' ); exit; } }

RPC_Db::factory()->disconnect();

?>

Obviously this is a major problem for me and I would greatly appreciate any help. If it helps, the person who touched it last said they changed the

false ) { header( 'Location: /page_not_found.html' ); exit; } } 

line but changed it back when they noticed a problem.