Responsive Theme – open link new window

Hi everybody,

I am using responsive the WP Theme and I would like to know how can I do if I want to make this link open in a new window. Here’s the code:
… and for the plugin lover, no I don’t want to use a plugin

echo '<ul class="social-icons">';
if (!empty($options['facebook_uid'])) echo '<li class="facebook-icon"><a href="' . $options['facebook_uid'] .  '">'.'<img src="' . get_stylesheet_directory_uri() . '/icons/facebook-icon.png" width="24" height="24" alt="Facebook" >'.'Facebook</a>';

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Thanks a lot!!!
Mike