How to avoid direct access to the forum?

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[rucanunes]

Hi,

I've placed this code on index.php of the SMF forum to avoid direct access to the forum:

Code:

// Redirect users who try to access /forum directly
if (strpos($_SERVER['QUERY_STRING'], 'dlattach') === false && strpos($_SERVER['QUERY_STRING'], 'verificationcode') === false)
{
        if(!defined('_VALID_MOS')){ header("Location: http://www.it-info.org/forum/overview.html".$_SERVER['QUERY_STRING']);}}

But than, the Preview Post function stops working. 

Can someone please help me here?

Thank you,
R Nunes