Comments script installation process

Notice: Undefined variable: error_message in /usr/home/martin/public_html/comments/install.php on line 186
Connecting to mysql ... done

Notice: Undefined variable: error_message in /usr/home/martin/public_html/comments/install.php on line 198
Creating table comments_data ...
Notice: Undefined variable: error_message in /usr/home/martin/public_html/comments/install.php on line 214
Creating table comments_junk ... Creating table comments_subscribes ... Creating table comments_banned ...
The following errors occured:
Table 'comments_data' already exists
Table 'comments_junk' already exists
Table 'comments_subscribes' already exists
Table 'comments_banned' already exists