Getting error for timer -Object doesn't support this property or method

Hi, 
I have timer control called  'employertimer
 <asp:Timer ID="employertimer" runat="server" Enabled="False" Interval="4000">
       
        </asp:Timer>
       

when i write  employertimer.Enabled = True. I get error: Object doesn't support this property or method  on IE and even in Firefox.
Javascript is enabled. I dont know why i am getting this error. Please check bold part below

 
        Dim sqlQuery As String
        sqlQuery = "Select [eid], [epwd] from [employer] where [eid] = '" & employerid.Text & "' and [epwd] = '" & employerpwd.Text & "'"

   &nbs ...