function SetDates(objDropDown, startDateFieldName, endDateFieldName){
	var i = objDropDown[objDropDown.selectedIndex].value;
	var objStartDate = new Date();
	var objEndDate = new Date();
	switch(i){
		case "1week":
			objStartDate = dateAdd("d", -7, objEndDate);
			break;
		case "1month":
			objStartDate = dateAdd("m", -1, objEndDate);
			break;
		case "3months":
			objStartDate = dateAdd("m", -3, objEndDate);
			break;
		case "6months":
			objStartDate = dateAdd("m", -6, objEndDate);
			break;
		case "12months":
			objStartDate = dateAdd("m", -12, objEndDate);
			break;
	}
	uiStartDate = document.getElementById(startDateFieldName);
	uiStartDate.value = GetDDMMYYYY(objStartDate);
	uiEndDate = document.getElementById(endDateFieldName);
	uiEndDate.value = GetDDMMYYYY(objEndDate);
}

function GetDDMMYYYY(objDate){
	var theDate = new Date(objDate);
	var day = new String(objDate.getUTCDate());
	if (day.length == 1)
		day = "0" + day;
	var month = new String(objDate.getUTCMonth()+1);
	if (month.length == 1)
		month = "0" + month;
	var year = new String(objDate.getUTCFullYear());
	var retval = day  + "/" + month + "/" + year;
	return  retval;
}