Serverpath med PHP

Hej alle

Jeg er total newbie med PHP, så dette er sikkert let for jer.

Jeg sidder og leger med at få et forum til at køre på en windows server

på serveren har jeg følgende biblioteker

db/GuestBook.txt
www/GuestBook.php


Hvordan får jeg nedenstående kode til at kigge et skridt længere tilbage end wwwroot, og ind i db folderen?

således at det får fat i filen guestbook.txt


(førhen lå guestbook.php og guestbook.txt i samme folder)


// ########## Reading and Writing the new data to the GuestBook Database #############

if ($Submit == "Yes") {
// Next line tells the script which Text file to open.
    $filename     = "GuestBook.txt";

// Opens up the file declared above for reading

    $fp         = fopen( $filename,"r");
    $OldData     = fread($fp, 80000);
    fclose( $fp );

// Gets the current Date of when the entry was submitted
    $Today         = (date ("l dS of F Y ( h:i:s A )",time()));

// Puts the recently added data into html format that can be read into the Flash Movie.
// You can change this up and add additional html formating to this area.  For a complete listing of all html tags
// you can use in flash - visit: http://www.macromedia.com/support/flash/ts/documents/htmltext.htm

    $Input = "Name: <b>$Name</b><br>Email: <b><u><a href=\"mailto:$Email\">$Email</a></u></b><br>Website: <b><u><a href=\"http://$Website\" target=\"_blank\">$Website</a></u></b><br>Comments: <b>$Comments</b><br><i><font size=\"-1\">Date: $Today</font><br><br>.:::.";

/* This Line adds the '&GuestBook=' part to the front of the data that is stored in the text file.  This is important because without this the Flash movie would not be able to assign the variable 'GuestBook' to the value that is located in this text file  */

    $New = "$Input$OldData";

// Opens and writes the file.

    $fp = fopen( $filename,"w");
    if(!$fp) die("&GuestBook=cannot write $filename ......&");
    fwrite($fp, $New, 800000);
    fclose( $fp );
}

// ###################################################################################