hi
I have a checkbox and a radiobuttonlist (the radiobuttonlist contains 2
items) in my form. The radiobuttonlist has its visible property set to false
at design time. At run time, when the checkbox is checked, then I want the
radiobuttonlist to appear. I want to use javascript.

On Form_Load I've done:
chkM.Attributes.Add("onclick", "ShowPeriod('" & RDLPeriod.ClientId &
"');return false;")

The HTML Source:

<TR>
    <TD>
<asp:Label id="Label8" runat="server">Monthly</asp:Label>&nbsp;
<asp:CheckBox id="chkM" runat="server" Width="81px"></asp:CheckBox>
    </TD>
    <TD colSpan="3">
       <asp:Label id="Label9" runat="server">Period</asp:Label>&nbsp;
       <asp:RadioButtonList id="RDLPeriod" runat="server"
RepeatDirection="Horizontal" Visible="False">
   <asp:ListItem Value="All">All</asp:ListItem>
  <asp:ListItem Value="Current Year">Current Year</asp:ListItem>
       </asp:RadioButtonList>
   </TD>
</TR>

In the script section I have:
function ShowPeriod(w)
{
  document.all(w).visible=true;
  //document.getElementById("RDLPeriod").style.visibility=true;
}

Upon execution, when I check the checkbox, the code breaks in the script
section and tells that :
   'document.all(...)' is null or not an object

Where is problem guys ?