[imp] SQL database in different server

[Bubuk Gabrok]

I setup Horde and am able to login.

Then I clicked on DataTree tab,
I changed the backend to SQL database.
Changed the Driver Configuration to Custom parameters.
Under 'What database backend should we use?' , I selected MySQL
I fillup the 'Username to connect to the database as'
I fillup the 'Password to connect with' and
I fillup the 'Database name to use'

(Note: there is no field that I can specify where (in wich server) my
database lives)

When I clicked on the 'Generate Horde Configuration' button, I got
tons of error messages:
A fatal error has occurred
DB Error: connect failed

[line 1637 of /usr/local/apache2/htdocs/pobox/lib/Horde/DataTree/sql.php]
Details (also in Horde's logfile):
...
...
...

I looked inside the logfile:
Feb 13 11:54:00 HORDE [emergency] [horde] DB Error: connect failed:
[nativecode=mysql_connect() [<a
href='function.mysql-connect'>function.mysql-connect</a>]: Access
denied for user 'horde'@'localhost' (using password: YES)] **
mysql(mysql)://horde:PASSWORD at unix+svr24/horde?persistent=&charset=iso-8859-1&driverconfig=horde&group=horde.perms&table=horde_datatree&table_attributes=horde_datatree_attributes
[on line 1637 of
"/usr/local/apache2/htdocs/pobox/lib/Horde/DataTree/sql.php"]

Question is, how do I tell Horde that my database lives in another
server and NOT localhost ?!

--
Bubuk