var TimeToFade = 1000.0;
var nextDivFader=1;
var prevDivFader=1;
var faderLimit=5;


function initPictureFader()
{
var arg = "nextFadeSession()";
var the_timeout = setTimeout(arg,4000);
var hu = window.location.search.substring(1);
nextDivFader= eval(Math.floor(Math.random()*5)+1);
prevDivFader=nextDivFader;
document.getElementById("div1").style.display="none";
document.getElementById("div"+nextDivFader).style.display="";
}

function nextFadeSession()
{
nextDivFader++;
if (nextDivFader>faderLimit)
   nextDivFader=1;
FadeElement("div"+prevDivFader, "div"+nextDivFader);
prevDivFader=nextDivFader;
var arg = "nextFadeSession()";
var the_timeout = setTimeout(arg,6000);
}

function FadeElement(elmId, nextElmId)
{
    var element = document.getElementById(elmId);
    if (element == null)
    {
        return;
    }
    if (element.FadeState == null)
    {
        if (element.style.opacity == null || element.style.opacity == '' || element.style.opacity == '1')
        {
            element.FadeState = 2;
        }
        else
        {
            element.FadeState = -2;
        }
    }
    if (element.FadeState == 1 || element.FadeState == -1)
    {
        element.FadeState = element.FadeState == 1 ? -1 : 1;
        element.FadeTimeLeft = TimeToFade - element.FadeTimeLeft;
    }
    else
    {
        element.FadeState = element.FadeState == 2 ? -1 : 1;
        element.FadeTimeLeft = TimeToFade;
        setTimeout("ExecFade(" + new Date().getTime() + ",'" + elmId + "','" + nextElmId + "')", 33);
    }
}

function ExecFade(lastTick, elmId, nextElmId)
{
    var curTick = new Date().getTime();
    var elapsedTicks = curTick - lastTick;
    var element = document.getElementById(elmId);
    if (element.FadeTimeLeft <= elapsedTicks)
    {
        element.style.opacity = element.FadeState == 1 ? '1' : '0';
        element.style.filter = 'alpha(opacity = ' + (element.FadeState == 1 ? '100' : '0') + ')';
        element.FadeState = element.FadeState == 1 ? 2 : -2;
        if ((element.FadeState == -2) && (nextElmId != ''))
        {
            document.getElementById(nextElmId).style.opacity = '0';
            document.getElementById(nextElmId).style.filter = 'alpha(opacity = 0)';
            document.getElementById(nextElmId).style.display = 'block';
            document.getElementById(elmId).style.display = 'none';
            FadeElement(nextElmId, '', '');
        }
        return;
    }
    element.FadeTimeLeft -= elapsedTicks;
    var newOpVal = element.FadeTimeLeft / TimeToFade;
    if (element.FadeState == 1)
    {
        newOpVal = 1 - newOpVal;
    }
    element.style.opacity = newOpVal;
    element.style.filter = 'alpha(opacity = ' + (newOpVal * 100) + ')';
    setTimeout("ExecFade(" + curTick + ",'" + elmId + "','" + nextElmId + "')", 33);
}