Javascript : Accessing ASP.NET RadioButtonList or CheckBoxList in Javascript

here is a sample radio button list

<asp:radiobuttonlist id="RadioButtonList1" runat="server">
           <asp:listitem value="1">One</asp:listitem>
           <asp:listitem value="2">Two</asp:listitem>
           <asp:listitem value="3">Three</asp:listitem>
</asp:radiobuttonlist>

here is a sample script to check atleast one item should be checked

function validateRadio()
{
   var count = <%=RadioButtonList1.Items.Count %>;
   var id = "<%=RadioButtonList1.ClientID%>";
   var checked = false;
   for(i=0;i<count;i++)
   {
      if(document.getElementById(id+"_"+i.toString()).checked==true)
      {
         checked = true;
         break;
      }
   }
   return checked;
}

RadioButtonList and CheckBoxList works exactly same way, so go ahead and use the same funtion for the CheckBoxList also, and you can create as many validations as you think of! happy coding :)