function advantage_menu(elem, disp)
{
    hide (elem, disp);
    if (disp)
    {
        show (elem);
    }
}

function show (elem)
{
    if (elem>0)
    {
        new Effect.Morph($('advantage_menu_layer'), {style: 'height: 200px; opacity: 1.0', duration: 0.5});
        $('advantage_menu_layer').style.display = 'block';
        $($('advantage_menu_headline_' + elem )).style.display = 'block';
        $($('advantage_menu_text_' + elem )).style.display = 'block';
    }
}

function hide (elem, disp)
{
    if (!disp)
    {
        new Effect.Morph($('advantage_menu_layer'), {style: 'height: 0px; opacity: 0.0', duration: 0.5});
    }
    for (var x=1; x<=4; x++)
    {
        if (disp && x != elem)
        {
        /*    $('advantage_menu_layer').style.display = 'none'; */
            $($('advantage_menu_headline_' + x )).style.display = 'none';
            $($('advantage_menu_text_' + x )).style.display = 'none';
        }
    }
}