var tm;

function cancelClose(){
    if(tm) {
        clearTimeout(tm);
    }
}

function showMenu(i) {
    document.getElementById('change_menu_'+i).style.display = 'block';
    cancelClose();
}

function closeMenu(i) {
    tm = setTimeout("hideMenu("+i+")",1000);
}

function hideMenu(i) {
    document.getElementById('change_menu_'+i).style.display = 'none';
}