function showDropDown (id)
{
    var dropdownm = document.getElementById (id);
    if (dropdownm)
    {
        dropdownm.style.display='block';
    }
}

function hideDropDown (id)
{
    var dropdownm = document.getElementById (id);
    if (dropdownm)
    {
        dropdownm.style.display='none';
    }
}