positioning AJAX CalendarExtender on top of other controls but z-index not working

i have <div style="position: absolute; left: 596px; width: 45px; top: 37px; height: 18px;       z-index: 121;">       <cc1:CalendarExtender ID="ceadt" runat="server" TargetControlID="txtaaadate">       </cc1:CalendarExtender>     </div> i have the zidex of other controls as 120 but still the CalendarExtender appears below other controls of the page how do i change the appearance of calendar control i mean templates and when i select the date from CalendarExtender it shld appear in the text box in dd/MM/yyyy format