404 Router Plugin help requested!

// Plugin: 404Router
// Aim: To redirect to my offers page if there is a /offer/ segment
/**
 * 404Router
 * @updated: 15 March 2009
 */
$debug = false;
$offerDocID = 62; 

// Getting the requested URL:
$RequestURL = $_SERVER['REQUEST_URI'];

// Testing if the requested URL points to the celebrities "folder":
if (strpos($RequestURL, "offers/") <> 0)
{
	// Isolating the FileName portion of the URL from the Document one:
	$url = str_replace("http://", "", $RequestURL);
	$split_url = explode('/', $url);

	if (sizeof($split_url ==3) )
	{
		$offerDocument = $split_url[3];

		$modx->offerDocument = $offerDocument;

		if ($debug==true) print '<p><b>'.$modx->offerDocument .'</b></p>';

		// Rerouting request to index.php without changing requested URL:
		//die("Do redirect to: $offerDocID");
	    $modx->sendForward( 62 );
	}
}

		// Rerouting request to index.php without changing requested URL:
		//die("Do redirect to: $offerDocID");
	        $_SERVER['REQUEST_URI'] = '';
               $modx->sendForward( $offerDocID ); 

/**
 * 404Router
 * @updated: 10 June 2009
 */

$debug = false;

// Getting the requested URL
$RequestURL = $_SERVER['REQUEST_URI'];

// Find position of first occurrence of a string
$pos = strpos($RequestURL, "offer/" );

if ($pos <> 0)
{
	// Single offer handling -----------------------
	$offerDocID = 23;
	$url = str_replace("http://", "", $RequestURL);
	$split_url = explode('/', $url);
	if ($debug == true) print "URL SPLIT: " . print_r($split_url);
	$offerDocument = $split_url[3];
	if ($debug == true) print $offerDocument;

	$modx->offerDocument = $offerDocument;

	// Rerouting request to index.php without changing requested URL:
	if ($debug == true) ("<p>Do redirect to: $offerDocID</p>");
	
	// Redirect
	$_SERVER['REQUEST_URI'] = '';
	$modx->sendForward( $offerDocID ); 
} // end if

# The Friendly URLs part
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?q=$1 [L,QSA]

# This is the rewrite rule I tried:
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^offer/([a-zA-Z0-9]+)/$ index.php?q=offer&offer_id=$1 [R=301,L]

System Settings
+ OnFriendlyURLSettingsRender	 -- What does this do?
+ OnInterfaceSettingsRender
+ OnMiscSettingsRender	
+ OnSiteSettingsRender
+ OnUserSettingsRender

Parser Service Events
+ OnFileManagerUpload	
+ OnPageNotFound
+ OnPageUnauthorized	
+ OnSiteRefresh
[i]There appears to be no parser service event for URL handling[/i]

			// Find position of first occurrence of `offer` in the requested URL
			$RequestURL = $this->documentIdentifier;
			$pos = strpos($RequestURL, "offer/" );
			if ($pos <> 0)
			{
				$url = str_replace("http://", "", $RequestURL);
				$split_url = explode('/', $url);
				if ($debug == true)
				{
					print "<br />URL SPLIT: " . print_r($split_url);
				} // end if
					
				// Build URL of page without the offer code
				if ( (is_array($split_url)) && (sizeof($split_url)>0) )
				{
					if (!$this->is_str_empty($split_url[0]))
					{
						$this->documentIdentifier = $split_url[0];
					}
					if (!$this->is_str_empty($split_url[1]))
					{
						$this->documentIdentifier .= '/' . $split_url[1];
					}
				} // end if
			} // end if