winW = window.innerWidth;
winH = window.innerHeight;
if (navigator.appName.indexOf("Microsoft")!=-1) {
    winW = document.body.offsetWidth;
    winH = document.body.offsetHeight;
}
    
function showPanel(el){
                    
    $('bg').style.width = winW;
    $('bg').style.height = winH;
    $('bg').style.display = "block";
    $(el).setOpacity(0);
    $(el).style.display = "block";
    var myFx = new Fx.Style(el,'opacity').custom(0,1);
}

function hidePanel(el){
    $('bg').style.display = "none";
    var myFx = new Fx.Style(el,'opacity').custom(1,0);
}