Fublin, только что валидатор показал зеленый свет на код
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="Lang" content="ru" />
<title>GB</title>
<link rel="stylesheet" href="../css/css.css" type="text/css" />
</head>
<body>
<form method="post" action="test.php">
<select name="go">
<option value="1">1</option>
</select> 
<input type="submit" name="knop" value="ok" />
</form>
</body>
</html>