if($_POST['submit'])
{
$ime = $_POST['ime'];
$sql = mysql_query("INSERT INTO gradove (grad) VALUES ('$ime')");
echo 'Успешно добавено';
}
?>
<form action="" method="post">
<input type="text" name="ime" /><br />
<input type="submit" name="submit" value='dobavi'/>
</form>