为什么这些复选框没有从代码后面进行检查?

下面是获取和设置参数的代码:

<script type="text/C#" runat="server">
    protected string Referrer = string.Empty;
    protected override void OnLoad(EventArgs e)
    {
        try
        {
            Referrer = Request.UrlReferrer.Segments[2].ToLower();
        }
        catch (System.Exception)
        {

            Referrer = string.Empty;
        }
        base.OnLoad(e);
    }
</script>

接下来,这里是复选框的集合:

<div id="interestSelect1" class="interestPad">
        <%= Html.CheckBoxFor(model => model.Interests[0])%>
        <label for="Interests_0_">Insulation</label>
        <%= Html.CheckBoxFor(model => model.Interests[1])%>
        <label for="Interests_1_">Windows</label>
        <%= Html.CheckBoxFor(model => model.Interests[2])%>
        <label for="Interests_2_">Siding</label>
        <%= Html.CheckBoxFor(model => model.Interests[3])%>
        <label for="Interests_3_">Roofing</label>
    </div>
    <div class="clear">
    </div>
    <div id="interestSelect2" class="interestPad">
        <%= Html.CheckBoxFor(model => model.Interests[4])%>
        <label for="Interests_4_">Gutters/Protection</label>
        <%= Html.CheckBoxFor(model => model.Interests[5])%>
        <label for="Interests_5_">Patio Doors</label>
    </div>

在浏览器中呈现时,以下是每个复选框的外观:

<input id="Interests_0_" name="Interests[0]" type="checkbox" value="true" />
<input name="Interests[0]" type="hidden" value="false" />
<label for="Interests_0_">Insulation</label>

<script type="text/javascript">
    var ref = '<%= Referrer %>';
    $(document).ready(function () {
        switch (ref) {
            case "insulation":
                $('Interests_0_').attr('checked', 'checked');
                break;
            case "windows":
                $('Interests_1_').attr('checked', 'checked');
                break;
            case "siding":
                $('Interests_2_').attr('checked', 'checked');
                break;
            case "roofing":
                $('Interests_3_').attr('checked', 'checked');
                break;
            case "gutters":
                $('Interests_4_').attr('checked', 'checked');
                break;
            case "patiodoors":
                $('Interests_5_').attr('checked', 'checked');
                break;
            default:
                // do nothing, not valid ref
        }
    });
</script>

我显然做错了什么,有人能指点我正确的方向吗?

谢谢!

编辑: # 标识符。