Preprocesses variables for forum-submitted.tpl.php.
The submission information will be displayed in the forum list and topic list.
$variables: An array containing the following elements:
theme_forum_submitted()
function template_preprocess_forum_submitted(&$variables) {
$variables['author'] = isset($variables['topic']->uid) ? theme('username', array(
'account' => $variables['topic'],
)) : '';
$variables['time'] = isset($variables['topic']->created) ? format_interval(REQUEST_TIME - $variables['topic']->created) : '';
}