How to do ?

[Jarungwit BOONPERM]

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Dear members,
    I used IMP-2.2.3, Horde-1.2.3 and Apache-1.3.14 on FreeBSD-4.1.1.
    My problem similar ...
       "4.1.1 How can I have Horde in a different directory than /horde/?"
at
    http://www.horde.org/faq/admin/config/index.php#c3

    But don't like at all.

    I install Horde in "/" (/usr/local/apache/htdocs)
        *** not in "/horde"
and IMP in "/imp". (/usr/local/apache/htdocs/imp)

    I config file "/config/horde.php3" below ...
        $default->horde_root_url = '/usr/local/apache/htdocs';

    Next I setup via browser that OK.
    But when I used URL below ...
        http://........../imp/index.php3
    It has error messages ...

        Fatal error: Call to undefined function: page_open() in
/usr/local/apache/htdocs/imp/index.php3 on line 15

    Please let me know how to solve this problem ?
Please tell me more detail because my bad skill in PHP.
		thank you very much.
		    regards,
		   Jarungwit.

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