function showCal(obj) {
  if (!obj) var obj = event.srcElement;
  var obDate;
  if (obj.value == "") {
  	obDate = new Date();
  }
  else {
    var obList = obj.value.split("-");
	obDate = new Date(obList[0], obList[1]-1, obList[2]);
  }
  var retVal = showModalDialog("calendar.htm", obDate,
		"dialogWidth=206px; dialogHeight=206px; help=no; scroll=no; status=no; ");
  if (typeof(retVal) != "undefined") {
  	var year = retVal.getFullYear();

  	var month = retVal.getMonth()+1;	
    if (month < 10)
	  month = "0" + month;
	
  	var day = retVal.getDate();
	if (day < 10)
	  day = "0" + day;

  	obj.value =year + "-" + month + "-" + day;

	

  }
}