[DUPLICATE] Microsoft JScript runtime error: 'style' is null or not an object

[Vasudhaika]

Hi...

when i click this button ,a new window has to open but im getting this error when i click on button
Microsoft JScript runtime error: 'style' is null or not an object....if(v=el.style[camel]) is undefined

<ext:ToolbarButton ID="btnEdit" runat="server" Text="Edit Record" Icon="ApplicationEdit">
                                        <AjaxEvents>
                                            <Click OnEvent="btnEdit_Click" >
                                            </Click>
                                        </AjaxEvents>
                                    </ext:ToolbarButton>
protected void btnEdit_Click(object sender, AjaxEventArgs e)
        {
            
                JournalEntryWindow.show();
            }

        }

NOTE: This thread is a duplicate of
http://forums.ext.net/showthread.php?12670