upload.html

        <script type="text/javascript">
            $(document).ready( function() {
                $("#addupForm").validate({
                    // Define as regras
                    rules:{
                        riffName:{
                            required: true, minlength: 2
                        },
			file: {
			      required: true,
			      accept: "wav|mp3|m4v|aac|3gp|mp4|caf"
		 	},

                    },
                    // Define as mensagens de erro para cada regra
                    messages:{
                        riffName:{
                            required: "You must to enter a riff name",
                            minlength: "The riff name must have 4 characters at least."
                        }
                    }
                });
            });
        </script>

        <h2>{% if riff %}Edit your riff {% else %} Upload your riff {% endif %}</h2>

	<br/>
        <form enctype="multipart/form-data" action="/upload/" method="post">
            <label>riff name</label>
            <input name="riffName" type="text" 
		{% if riff %} 
		value="{{ riff.name }}" />
		{% else %}
		value="" />
		{% endif %}

            <label>musical instrument</label>
	<select name="musicalInstrument">
{% for i in InstrumentsList %}
		<option 
		{% if riff %}
			{% ifequal riff.instrument i %}
				SELECTED 
			{% endifequal %}
		{% endif %}
		value="{{i}}"> {{i}} </option>
{% endfor %}
	</select>

            <label>musical genre</label>
	<select name="musicalGenre">
{% for i in GenresList %}
		<option 
		{% if riff %}
			{% ifequal riff.genre i %}
				SELECTED 
			{% endifequal %}
		{% endif %}
		value="{{i}}"> {{i}} </option>
{% endfor %}
	</select>
   <br/>
{% if not riff %}

            <label>riff file</label>
	        <input type="file" name="file" /><br/>
		<input type="hidden" name="id" id="id" value="none"/>
{% else %}
		<input type="hidden" name="id" id="id" value="{{ riff.key.id }}"/>
{% endif %}
            <input type="submit" class="submit" value="Enviar" />
        </form>