function wp_get_delim($ref) {
    // Search engine match array
    // Used for fast delimiter lookup for single host search engines.
    // Non .com Google/MSN/Yahoo referrals are checked for after this array is checked

    $search_engines = array('google.com' => 'q',
			'go.google.com' => 'q',
			'maps.google.com' => 'q',
			'local.google.com' => 'q',
			'search.yahoo.com' => 'p',
			'search.msn.com' => 'q',
			'msxml.excite.com' => 'qkw',
			'search.lycos.com' => 'query',
			'search.live.com' => 'q',
			'alltheweb.com' => 'q',
			'search.aol.com' => 'query',
			'search.iwon.com' => 'searchfor',
			'ask.com' => 'q',
			'ask.co.uk' => 'ask',
			'search.cometsystems.com' => 'qry',
			'hotbot.com' => 'query',
			'overture.com' => 'Keywords',
			'metacrawler.com' => 'qkw',
			'search.netscape.com' => 'query',
			'looksmart.com' => 'key',
			'dpxml.webcrawler.com' => 'qkw',
			'search.earthlink.net' => 'q',
			'search.viewpoint.com' => 'k',
			'mamma.com' => 'query');

    $delim = false;
    // Check to see if we have a host match in our lookup array
    if (isset($search_engines[$ref])) {
        $delim = $search_engines[$ref];
    } else {
        // Lets check for referrals for international TLDs and sites with strange formats

        // Optimizations
        $sub13 = substr($ref, 0, 13);

        // Search string for engine
        if(substr($ref, 0, 7) == 'google.')
			$delim = "q";
		elseif($sub13 == 'search.atomz.')
            $delim = "sp-q";
        elseif(substr($ref, 0, 11) == 'search.msn.')
            $delim = "q";
        elseif($sub13 == 'search.yahoo.')
            $delim = "p";
        elseif(preg_match('/home\.bellsouth\.net\/s\/s\.dll/i', $ref))
            $delim = "bellsouth";
    }

    return $delim;
}

function wp_get_refer() {
    if (!isset($_SERVER['HTTP_REFERER']) || ($_SERVER['HTTP_REFERER'] == '')) return false;

    $referer_info = parse_url($_SERVER['HTTP_REFERER']);
    $referer = $referer_info['host'];
	$path = $referer_info['path'];
	if(($referer == 'www.google.com') && (substr($path, 1, 6) == 'reader'))	return false; // Google Reader Hack
    if(substr($referer, 0, 4) == 'www.')
        $referer = substr($referer, 4);
    return $referer;
}


$referer = wp_get_refer();
if ($referer) {
	$delimiter = wp_get_delim($referer);
	if ($delimiter) return;
}