Ciao a tutti, non capisco perchè il logo non mi si centra. Qui sotto il codice:

Codice PHP:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" dir="ltr" lang="<?php echo str_replace('_', '-', osc_current_user_locale()); ?>">
    <head>
        <?php osc_current_web_theme_path('head.php') ; ?>
    </head>
    <body class="<?php osc_run_hook('body_class'); ?>">
    <div id="container">
    <div id="header">
        <div class="wrapper">
          <div align="center">[url="<?php echo osc_base_url() ; ?>"][b]<?php echo logo_header() ; ?>[/b][/url]
            </div>
          <div id="user_menu"></div>


        <ul id="nav">
Grazie