var activeMenuitem = null;

function FadeIn()
{
    var block = document.getElementById('datacontainer');
    new Effect.Appear(block, { to: 0.92 });
}

function FadeOut()
{
    var block = document.getElementById('contentdata');
    new Effect.DropOut(block);
}

function SetActiveMenuitem(id)
{
    var img = document.getElementById(id);
    img.src = "../images/btn-" + id + "-actief.gif";
    activeMenuitem = id;
}

function SwapBtn(obj, src)
{
    obj.src = src;
}

function SwapMenuBtn(id, toggle)
{
    if (id == activeMenuitem) return false;
    
    var img = document.getElementById(id);
    if (toggle == "on")
    {
        img.style.cursor = "hand";
        img.src = "../images/btn-" + id + "-actief.gif";
    }
    else
    {
        img.src = "../images/btn-" + id + "-inactief.gif";
    }
}

function LinkClick(url)
{
    document.location = url;
}