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One of the biggest issues i was having is when you typed in my url for my website it wasnt going to my xoop directory hence my page wouldnt load. Well did a lil research on the net and found you can do this and it will work just fine and you will never know the differance
header("Location:
http://yoururl.com/directory");
?>
Then save it as index.php and presto instant redirecting to the correct path