<div style="position:absolute;z-index : 10000">
                                        <asp:TextBox ID="txtStartDate" Width="90px" CssClass="roundCornerText" runat="server"></asp:TextBox><asp:RequiredFieldValidator
                                                ID="RequiredFieldValidator6" runat="server" ControlToValidate="txtStartDate"
                                                CssClass="errFlag" Display="none" ErrorMessage="Please enter Start Date.">*</asp:RequiredFieldValidator>
                                        <ajaxToolkit:CalendarExtender ID="CalendarExtender1" runat="server" TargetControlID="txtStartDate"
                                            CssClass="Calendar" Format="MM/dd/yyyy" PopupButtonID="btnCalImage"/>
                                        <asp:Image ID="btnCalImage" align="absmiddle" runat="server" ImageUrl="~/images/calender.png"
                                            ToolTip="Calender" Style="cursor: pointer;" />
                                        </div>