var REFRESH_BANNER_SECS = 10 ;
var FADING_SECS = 1 ;

function getXmlHttpIstance()
{
    var xmlHttp;
    try
    {  // Firefox, Opera 8.0+, Safari
        return xmlHttp=new XMLHttpRequest();
    }
    catch (e)
    {  // Internet Explorer
        try
        {
            return xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch (e)
        {
            try
            {
                return xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch (e)
            {
                alert("Your browser does not support AJAX!");
                return false;
            }
        }
    }
}

function loadBannerRotate()
{
    var xmlHttpBanner = getXmlHttpIstance();
    if( xmlHttpBanner )
    {
        xmlHttpBanner.onreadystatechange=function()
        {
            if(xmlHttpBanner.readyState==4)
            {
                newDivBanner = xmlHttpBanner.responseText;
                document.getElementById("bannerFade").innerHTML=newDivBanner;
                fadeInElement('bannerFade',FADING_SECS,function(){changeBanner()});
            }
        }
        xmlHttpBanner.open("GET","/soci-sostenitori/logo",true);
        xmlHttpBanner.send(null);
    }
}
function hideBanner()
{
 
    fadeOutElement('bannerFade',FADING_SECS,function(){loadBannerRotate()});
}
function changeBanner()
{
    newDivBanner=''
    setTimeout(hideBanner,1000*REFRESH_BANNER_SECS);
}