<jengo> <form>
<jengo>   <input name="notes_font" value="<php echo $phpgw_info["user"]["preferences"]["notes"]["font_size"]; ?>">
<jengo>   <input type="submit" name="submit" value="submit">
<jengo> </form>
<jengo> if ($submit) {
<jengo>    $phpgw->preferences->preferences_add($phpgw_info["user"]["account_id"],"notes_font");
<jengo> }
<jengo> ok, thats a quick and to the point version
<jengo> correction
<jengo>   <input name="notes_font" value="<php echo $phpgw_info["user"]["preferences"]["notes"]["notes_font"]; ?>">
