C# - Fetch The Value Of Selected Checkbox Inside A CheckboxList?

I want to know the selected value of the markup below. So that I can disabled a textbox, if one of the checkbox is selected.

<asp:CheckBoxList ID="ChkTest" runat="server" RepeatDirection="Horizontal" CssClass="toggleYesNo">
<asp:ListItem Value="1">Yes</asp:ListItem>
<asp:ListItem Value="0">No</asp:ListItem>
</asp:CheckBoxList>

I tried using this function it doesnot seem to work

$(document).ready(function() {
$("#<%=ChkTest.ClientID %>").click(function() {
value = $(this).val();
if(value=='1') {
$('#atextbox').attr('disabled','');
}
else {
$('#atextbox').attr('disabled','disabled');
}
});
});

I also track the output HTML but the id the CheckBoxList the assigned to a table instead.

UPDATED

<table id="ChkTest" class="toggleYesNo" border="0">
<tr>
<td><input id="ChkTest_0" type="checkbox" name="ChkTest$0" /><label for="ChkTest_0">Yes</label></td><td><input id="ChkTest_1" type="checkbox" name="ChkTest$1" /><label for="ChkTest_1">No</label></td>
</tr>
</table>