button to send invitation only to the admin

fathox

public.php found in the code where the user is logged on the button to send invitation shows, the more I want to do it this way: if the User ID logged is equal to 1 which is the admin button then shows p if not, it shows the button ... I found the code is this:

function showSections()
{
// Show invite button, as long as site isn't closed, and
// we have a logged in user.
if (!common_config('site', 'closed') && common_logged_in()) {
if (!common_config('site', 'private')) {
$ibs = new InviteButtonSection(
$this,
// TRANS: Button text for inviting more users to the StatusNet instance.
// TRANS: Less business/enterprise-oriented language for public sites.
_m('BUTTON', 'Send invite')
);
} else {
$ibs = new InviteButtonSection($this);
}
$ibs->show();
}

$pop = new PopularNoticeSection($this);
$pop->show();
if (!common_config('performance', 'high')) {
$cloud = new PublicTagCloudSection($this);
$cloud->show();
}
$feat = new FeaturedUsersSection($this);
$feat->show();