function drop_(obj){	

    if(document.getElementById(obj)) {
        var e = document.getElementById(obj);
        var c = document.getElementById('check_' + obj);
        var it = document.getElementById('item_' + obj);
        if(!c || c.value == 1 ) {
            e.style.visibility = "visible";
        }
        it.className = "itemHover";
    }
}

function hide_(obj){	

    if(document.getElementById(obj)) {
        var e = document.getElementById(obj);
        var it = document.getElementById('item_' + obj);
        e.style.visibility = "hidden";
        it.className = "item";
    }
}