How to change the icon sizes displayed in Knowledgebase Publisher

The folder and article icons can be found in kb/licent/images/icons. The size at which they are displayed are set in client/inc/KBClientView.php:

function _getItemImg($registered, $var, $category = false, $ext = false) {
       
        //if($var && !$registered && $this->isExtra('private')) {
        if($var && !$registered) {
            $tag = '<img src="%simages/icons/lock1.gif" alt="private" width="14" height="16" title="%s" />';
            $tag = sprintf($tag, $this->controller->client_path, $this->msg['login_to_view_msg']);
       
        } elseif($category === 'file') {
            $_file = sprintf('%sclient/images/filetypes/%s.png', $this->controller->kb_dir, $ext);
            $file = sprintf('%simages/filetypes/%s.png', $this->controller->client_path, $ext);
            if(!file_exists($_file)) {
                $file = sprintf('%simages/filetypes/%s.png', $this->controller->client_path, 'file');
            }
           
            $tag = sprintf('<img src="%s" alt="file" width="18" height="16" />', $file);       
           
        } else {
            $tag = ($category) ? '<img src="%simages/icons/folder.gif" alt="folder" width="15" height="12" />'
                               : '<img src="%simages/icons/article.gif" alt="document" width="11" height="14" />';
            $tag = sprintf($tag, $this->controller->client_path);
        }

        return $tag;
    }