var menuHoldId;

function showMenu()
{
    hideMenus();
    clearTimeout(menuHoldId);
    document.getElementById('menu1').style.visibility = "visible";
}

function hideMenu()
{
    menuHoldId = setTimeout('nowHideMenu()',500);
}

function nowHideMenu()
{
    document.getElementById('menu1').style.visibility = "hidden";
}

var menu2HoldId;

function showMenu2()
{
    hideMenus();
    clearTimeout(menu2HoldId);
    document.getElementById('menu2').style.visibility = "visible";
}

function hideMenu2()
{
    menu2HoldId = setTimeout('nowHideMenu2()',500);
}

function nowHideMenu2()
{
    document.getElementById('menu2').style.visibility = "hidden";
}


var menu3HoldId;

function showMenu3()
{
    hideMenus();
    clearTimeout(menu3HoldId);
    document.getElementById('menu3').style.visibility = "visible";
}

function hideMenu3()
{
    menu3HoldId = setTimeout('nowHideMenu3()',500);
}

function nowHideMenu3()
{
    document.getElementById('menu3').style.visibility = "hidden";
}


function hideMenus()
{
    document.getElementById('menu1').style.visibility = "hidden";
    document.getElementById('menu2').style.visibility = "hidden";
    document.getElementById('menu3').style.visibility = "hidden";
}