Select onChange

[Cap.Buscapina]

y así:

<form action="galerias.php" method="post" onchange="this.submit();">
<select name="anio" id="anio" >
<option selected>Seleccione el Año</option>
<option value="05">2005</option>
<option value="06">2006</option>

</select>
<input type="submit" name="Submit22" value="ir">
</form>