can we able to alert the user with "not-allowed" when the cursor
is on other days when he tries to select?

    <igsch:webdatechooser id="txt_DateFrom" runat="server"  ClientSideEvents-CalendarValueChanging="_calendarchanging()" nulldatelabel="" style="z-index: 104;
        left: 395px; position: absolute; top: 128px"> <CALENDARLAYOUT TitleFormat="Month"  PrevMonthImageUrl="ig_cal_blueP0.gif" NextMonthImageUrl="ig_cal_blueN0.gif" /></igsch:webdatechooser>

in the BLOCKED SCRIPT

<script type="text/javascript" language="javascript">
function _calendarvaluechanging(oCalendar, oDate, oEvent)
{
 if (oDate.getDay() != 1) {
        oEvent.cancel = true;
    }
}

</script>

But there is no effect.

When the user opens the calendar, all the days and dates should be visible(but only the dates of mondays to be enabled of every month to select, all others should be disabled).

Thank you for your time in advance.