function DisableCombo(ItemName)
{
//    var Item = document.getElementById(ItemName);
//    Item.disabled = true;
}

function ClearCombo(ItemName)
{
    var Item = document.getElementById(ItemName);
    Item.options.length=0;
    Item.disabled = true;
}


function EnableCombo(ItemName)
{
    var Item = document.getElementById(ItemName);
    Item.disabled = false;
    Item.focus();
}