Len pre inšpiráciu:

<? $options = array("jedna" => "jednicka", "dva" => "dvojka", "tri" => "trojka") ?>
<? $selected = isset($_POST["mnau"]) ? $_POST["mnau"] : null ?>
<form action="" method="post">
	<select name="mnau" onchange="this.form.submit()">
<? foreach ($options as $value => $name): ?>
		<option value="<?=htmlspecialchars($value)?>"<?=$value == $selected ? ' selected="selected"' : ""?>><?=htmlspecialchars($name)?></option>
<? endforeach ?>
	</select>
	<noscript><input type="submit" /></noscript>
</form>