var doFade = true;
var currentFade = 1;
var tickerTimer;
var currentProd=1;

window.onload = function() {
    startTimer();
}

//fades products in and ou
function fadeTicker(){
    if(doFade){
        opacity('tickerProd'+currentFade, 100, 0, 500);
        setTimeout('hide(\''+ currentFade +'\')',500);
        currentFade++;
        if(currentFade>numProds){
            currentFade=1;
        }

        setTimeout('show(\''+ currentFade +'\')',500);
        setTimeout('opacity(\'tickerProd'+currentFade+'\',0, 100, 700)',700);
        startTimer();
    }
}


function show(prodID){
    document.getElementById('tickerProd'+prodID).style.display='';
    document.getElementById('changer'+prodID).className='active';
}

function hide(prodID){
    document.getElementById('tickerProd'+prodID).style.display='none';
    document.getElementById('changer'+prodID).className='';
}

function changeProd(prodToShow){
    clearTimeout(tickerTimer);
    if(prodToShow>numProds){
        prodToShow= currentProd=1;
    }
    if(prodToShow<1){
        prodToShow= currentProd=numProds;
    }
    currentFade=prodToShow;

    for(var j=1;j<=numProds;j++){
        document.getElementById('changer'+j).className='';
        document.getElementById('tickerProd'+j).style.display='none';
        document.getElementById('tickerProd'+j).style.opacity=0;
        document.getElementById('tickerProd'+j).style.MozOpacity=0;
        document.getElementById('tickerProd'+j).style.KhtmlOpacity=0;
        document.getElementById('tickerProd'+j).style.filter="alpha(opacity=0)";
    }
    document.getElementById('tickerProd'+prodToShow).style.display='';
    document.getElementById('tickerProd'+prodToShow).style.opacity=100;
    document.getElementById('tickerProd'+prodToShow).style.MozOpacity=100;
    document.getElementById('tickerProd'+prodToShow).style.KhtmlOpacity=100;
    document.getElementById('tickerProd'+prodToShow).style.filter="alpha(opacity=100)";
    document.getElementById('changer'+prodToShow).className='active';
}

function startTimer(){
    tickerTimer = setTimeout('fadeTicker()',12000);
}

//modified version of code from http://brainerror.net/scripts/javascript/blendtrans/
function opacity(id, opacStart, opacEnd, millisec) {
    //speed for each frame
    var speed = Math.round(millisec / 100);
    var timer = 0;

    //determine the direction for the blending, if start and end are the same nothing happens
    if(opacStart > opacEnd) {
        for(i = opacStart; i >= opacEnd; i--) {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            timer++;
        }
    } else if(opacStart < opacEnd) {
        for(i = opacStart; i <= opacEnd; i++)
            {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            timer++;
        }
    }
}

//change the opacity for different browsers
function changeOpac(opacity, id) {
    var object = document.getElementById(id).style;
    object.opacity = (opacity / 100);
    object.MozOpacity = (opacity / 100);
    object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
}