function setOpacity(idDiv) {
    alert(1);
    document.getElementById(idDiv).xOpacity = .99;
    setOpacity(idDiv);
}

function xfade(idDiv) {
    var divFade = document.getElementById(idDiv);
    var Opacity = divFade.xOpacity;
    Opacity -= .03;
    divFade.xOpacity = Opacity;
    setOpacity(idDiv);
    if (Opacity <= 0) {
        divFade.className = "invisibileAnimazione";
    }
    else {
        setTimeout("xfade('" + idDiv + "')", 30);
    }
    
}

function setOpacity(Div) {
    var obj = document.getElementById(Div);
    if(obj.xOpacity>.99)
    {
	    obj.xOpacity = .99;
        return;
    }
    obj.style.opacity = obj.xOpacity;
    obj.style.MozOpacity = obj.xOpacity;
    obj.style.filter = 'alpha(opacity=' + (obj.xOpacity*100) + ')';
}