Asp.net Ajax Calendar Extender and Past Date Validation Javascript

<script language=”javascript” type=”text/javascript”>

function CheckForPastDate(sender, args) {

var selectedDate = new Date();

selectedDate = sender._selectedDate;

var todayDate = new Date();

if (selectedDate.getDateOnly() < todayDate.getDateOnly()) {

sender._selectedDate = todayDate;                  sender._textbox.set_Value(sender._selectedDate.format(sender._format));

alert(“Date Cannot be in the past”);

}

}

</script>

<asp:TextBox ID=”txtDate” contentEditable=”false” runat=”server” CssClass=”txtcss”></asp:TextBox>&nbsp;

<asp:Image ID=”imgCal” runat=”server” ImageUrl=”~/img/calendar.gif” />

<cc1:CalendarExtender ID=”CalExtDate” runat=”server” FirstDayOfWeek=”Sunday” PopupButtonID=”imgCal”PopupPosition=”BottomLeft” Format=”dd/MM/yyyy” OnClientDateSelectionChanged=”CheckForPastDate” TargetControlID=”txtDate”>

</cc1:CalendarExtender>