function chooseLang () {
	global $wiki_Languages;
	$pref=array();
	
	foreach(explode(',', $_SERVER["HTTP_ACCEPT_LANGUAGE"]) as $lang)
		if (preg_match('/^([a-z]+)[^;]*;q=([0-9.]+)/i', $lang . ';q=1.0', $split))
				$pref[sprintf("%f%d", $split[2], rand(0,9999))]=strtolower($split[1]);
	
	krsort($pref);
	$junk_1 = array_intersect($pref, $wiki_Languages);
	$junk_2 = array_merge( $junk_1, $wiki_Languages);
	return array_shift( $junk_2 );
}