Database's dir to change,setting?

[xsoho]

Move Database's Dir to /www/mysql
091124 15:57:46 mysqld_safe Starting mysqld daemon with databases from /www/mysql
091124 15:57:46 [Note] Plugin 'FEDERATED' is disabled.
/opt/lampp/sbin/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13)
091124 15:57:46 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
091124 15:57:46 InnoDB: Started; log sequence number 0 44243
091124 15:57:46 [ERROR] /opt/lampp/sbin/mysqld: Can't create/write to file '/www/mysql/usa1.handbags.com.pid' (Errcode: 13)
091124 15:57:46 [ERROR] Can't start server: can't create PID file: Permission denied
091124 15:57:46 mysqld_safe mysqld from pid file /www/mysql/usa1.handbags.com.pid ended