http://localhost/cacti/install One error happen~

[qqbasan]

after i type http://localhost/cacti/install ,have an error message appear..
see ti below:
Warning: mysql_pconnect() [function.mysql-pconnect]: Client does not support authentication protocol requested by server; consider upgrading MySQL client in /opt/htdocs/cacti/lib/adodb/drivers/adodb-mysql.inc.php on line 355

Error
You have created a new database, but have not yet imported the 'cacti.sql' file. At the command line, execute the following to continue:
mysql -u cactiuser -p cacti < cacti.sql
This error may also be generated if the cacti database user does not have correct permissions on the cacti database. Please ensure that the cacti database user has the ability to SELECT, INSERT, DELETE, UPDATE, CREATE, ALTER, DROP, INDEX on the cacti database.
help me .thx~

[qqbasan]

well ,now I tried to start the poller.php like below
#/opt/php/bin/php /opt/htdocs/cacti/poller.php
and i get the error below

Warning: mysql_pconnect(): Client does not support authentication protocol requested by server; consider upgrading MySQL client in /opt/htdocs/cacti/lib/adodb/drivers/adodb-mysql.inc.php on line 356

Warning: mysql_pconnect(): Client does not support authentication protocol requested by server; consider upgrading MySQL client in /opt/htdocs/cacti/lib/adodb/drivers/adodb-mysql.inc.php on line 356

Is anybody know it?