function panelHidden(div)
{
    document.getElementById(div).className='panelOff';
}
function panelVisible(div)
{
    document.getElementById(div).className = 'panelOn';
}


function ClearDefaultItem(combo)
{
    curVal = combo.GetValue();
    if(curVal == '-1')
    {
        combo.ClearSelection();
        combo.ClearItems();
    }
}