How to make panel visible true in javascript function

Hi All,
How to make asp.net panel visible to true in javascript fucntion.
here is my code, but it is not working.

    <script>
         function ShowContinue()
         {
            document.getElementById('<%=pnlContinue.ClientID%>').style.visibility="visible";
         }  
    </script>
   <asp:Panel ID="pnlContinue" runat="server" Visible="false">
         Welcome Suresh!
   </asp:Panel>


please help me..

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