how do i access my root folders, through my php script?

i have this include function in a file inside another folder called ajax, but it wnt let me access this include file:

include("includes/connect.php");

i dont know what to do, thanks, and im using localhost?

Warning: include(includes/connect.php) [function.include]: failed to open stream: No such file or directory in C:\xampp\htdocs\final\ajax\moreProfileUpdates.php on line 2
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Your include() function is trying to locate ajax/includes/connect.php, which doesn't exist. Try changing it to:

// assumes 'includes' directory is one directory up from the 'ajax' directory
include '../includes/connect.php';