<form action="." method="POST" id="formid">
        <input type="hidden" name="caller" value="">
        <label for="fader{{channel.attr['id']}}">{{channel.attr['name']}}</label>
        <input type="range" name="fader" id="fader{{channel.attr['id']}}" min="0" max="100" value="{{channel.attr['P']}}">
    </form>

    <script src="jquery.min.js"></script>

    <script>
        $("input[type='range']").change(function(){
            $('#callerid').val(this.id);
            $('#formid').submit();
        });
    </script>