function hide(id)
{
    var o = document.getElementById(id);
    if (o != null)
    {
        o.style.visibility = 'hidden';
        o.style.display = 'none';
    }
}

function show(id)
{
    var o = document.getElementById(id);
    if (o != null)
    {
        o.style.visibility = 'visible';
        o.style.display = 'block';
    }
}

function load_changed()
{
    var o = document.getElementById('loadDDL'); 
    if (o != null)
    {
        var size = o.options[o.selectedIndex].text;
        
        switch (size)
        {
            case '150' : show('150load'); hide('432load'); break;
            case '918' :
            case '432' : show('432load'); hide('150load'); break;
        }
    }
}