Hi,
function calendarPickerCSD(stat)
{
//alert(stat);
var ret=window.showModalDialog('PopupCal.aspx?ShowDate='+ document.getElementById('Usrdate_txtSignDate').value+ '','calendarPopup',stat);
if (ret!=null)
document.getElementById('UsrSite_txtSignDate'').innerText=ret
alert("Sign Date can not be changed after the page gets saved.");
}