Edit in JSFiddle

<form>
  <select name="day" size="1">
    <option value="1">Lundi</option>
    <option value="2">Mardi</option>
    <option value="3">Mercredi</option>
    <option value="4">Jeudi</option>
    <option value="5" selected="selected">Vendredi</option>
  </select>
</form>