function zeige_overlay(overlay)
{
    document.getElementById("haus").className = (overlay ? overlay : "");
}

/*
// Osterei 

window.locked = false;

function zeige_overlay(overlay)
{
    if (!window.locked) document.getElementById("haus").className = (overlay ? overlay : "");
}

function zeige_osterei(overlay)
{
    window.locked = true;
    document.getElementById("haus").className = (overlay ? overlay : "");
}

function verstecke_osterei()
{
    window.setTimeout(function () { window.locked = false; zeige_overlay(); }, 5000);
}
*/