/*****

Image Cross Fade Redux
Version 1.0
Last revision: 02.15.2006
steve@slayeroffice.com

Please leave this notice intact.

Rewrite of old code found here: http://slayeroffice.com/code/imageCrossFade/index.html


*****/


window.addEventListener?window.addEventListener("load",so_init,false):window.attachEvent("onload",so_init);



var d=document, imgs = new Array(), zInterval = null, current=0, pause=false;
//newcur = new Array();
//var j = 0;

function so_init() {
    if(!d.getElementById || !d.createElement)return;

    // DON'T FORGET TO GRAB THIS FILE AND PLACE IT ON YOUR SERVER IN THE SAME DIRECTORY AS THE JAVASCRIPT!
    // http://slayeroffice.com/code/imageCrossFade/xfade2.css
    css = d.createElement("link");
    css.setAttribute("href","xfade2.css");
    css.setAttribute("rel","stylesheet");
    css.setAttribute("type","text/css");
    d.getElementsByTagName("head")[0].appendChild(css);


    imgs = d.getElementById("imageContainer").getElementsByTagName("img");
    pocet = imgs.length;

    //náhodne vybereme od kterého se bude zacínat (bo první by byl ve výhode)
//    if (newcur.length > 0) {
//        current = Math.ceil(Math.random() * pocet) -1;
//        for (k = 0; k < newcur.length; k++) {
//            if (current == newcur[k]) {
//                current = Math.ceil(Math.random() * pocet) -1;
//                k = 0;
//            }
//        }
//    } else current = Math.ceil(Math.random() * pocet) -1;

    current = Math.ceil(Math.random() * pocet) -1;

//    newcur[j] = current;
//    j++;
	
    //current += 4;
    //var current = <?php echo $_SESSION['start']; ?>;


    for(i=0;i<imgs.length;i++) imgs[i].xOpacity = 0;

    imgs[current].style.display = "block";
    imgs[current].xOpacity = .99;

    setTimeout(so_xfade,5000);
}

function so_xfade() {
    cOpacity = imgs[current].xOpacity;
    if (current==imgs.length-1)
        nIndex = 0;
    else
        nIndex = current+1;

    nOpacity = imgs[nIndex].xOpacity;

    cOpacity-=.05;
    nOpacity+=.05;

    imgs[nIndex].style.display = "block";
    imgs[current].xOpacity = cOpacity;
    imgs[nIndex].xOpacity = nOpacity;

    setOpacity(imgs[current]);
    setOpacity(imgs[nIndex]);

    if(cOpacity<=0) {
        imgs[current].style.display = "none";
        current = nIndex;
        setTimeout(so_xfade,5000);
    } else {
        setTimeout(so_xfade,50);
    }

    function setOpacity(obj) {
        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) + ")";
    }

}