<asp:Repeater ID="Repeater1" runat="server" DataSource="<%# GetSecondAreas(CurrentLocationName) %>">
<HeaderTemplate>
<ul>
</HeaderTemplate>
<ItemTemplate>
<li class="area">
<input type="checkbox" class="category" value="<%# string.Concat(CurrentLocation.Area1,"| ", CurrentLocation.Area2)%>" />
<label>
<%#CurrentLocation.Area2%>
</label>
<asp:Repeater ID="Repeater2" runat="server" DataSource="<%# GetThirdAreas(CurrentLocation.Area2) %>">
<HeaderTemplate>
<ul>
</HeaderTemplate>
<ItemTemplate>
<li>
<input type="checkbox" class="category" value="<%#string.Concat(CurrentLocation.Area1,"| ", CurrentLocation.Area2,"| ", CurrentLocation.Area3)%>" />
<label id="last">
<%#CurrentLocation.Area3%>
</label>
</li>
</ItemTemplate>
<FooterTemplate>
</ul>
</FooterTemplate>
</asp:Repeater>
</li>
</ItemTemplate>
<FooterTemplate>
</ul>
</FooterTemplate>
</asp:Repeater>

function updateByArea(current) {
//If current is unchecked => uncheck all child checkboxes
if (current.attr("checked") == null || current.attr("checked") == "")
    $j(".area ul li input[value^='" + current.val() + "']:checked").removeAttr("checked").hide(); //checkbox
    $j('label[id="id_val"]').hide();
$j("#searchFilter .area>input:checkbox:checked").each(function (i, item) {
    $j(".area ul li input[value^='" + $j(item).val() + "']:not(:checked)").attr("checked", "checked").show(); //checkbox
    $j('label[id="id_val"]').show();
});

.hide();

.parent().hide();