function CheckValidDate(sValueToTest)
{
    var cYEAR = 2, cMONTH = 1, cDAY = 0; // ### change these for other date formats 
    var bOK = true;

        // attempt to convert to a date (assume dd/mm/yyyy format)
        var dtValueToTest;
        var aDate;
        try
        {
            // ### change this for other date formats ###
            aDate = sValueToTest.split("\/");  
            dtValueToTest = new Date(aDate[cYEAR], aDate[cMONTH] - 1, aDate[cDAY]);
            if ( isNaN(dtValueToTest) )
            {
                bOK = false;
            }
        }
        catch (e)
        {
            bOK = false;
        }

        // if the date conversion succeeded, check its the actual date that was input
        // (e.g. it will accept 31/2/2003 but will change it to 3/3/2003)
        if (bOK)
        {
            // is it the same year?
            if (aDate[cYEAR] != dtValueToTest.getFullYear())
                bOK = false;

            // is it the same month?
            if (aDate[cMONTH] != 1 + dtValueToTest.getMonth())
                bOK = false;

            // is it the same day?
            if (aDate[cDAY] != dtValueToTest.getDate())
                bOK = false;
        }

    return (bOK);
}