var FadePic = {

    oldWinOnLoad: false,
    inits:  new Array(),
    faders: new Object(),

    init: function(einstellungen) {
        var fader;
        if (this.inits) {
            this.inits[this.inits.length] = einstellungen;
        } else {
            fader = new this.Fader(einstellungen);
            if (fader != false && ! this.faders[einstellungen.id]) {
                this.faders[fader.id] = fader;
                window.setTimeout(function() { fader.next(); }, fader.viewTime);
            }
        }
    },

    start: function() {
        this.oldWinOnLoad = window.onload;
        window.onload = function() {
            if (typeof(FadePic.oldWinOnLoad) == "function") {
                FadePic.oldWinOnLoad();
            }
            FadePic.onload();
        };
    },

    onload: function() {
        var i, fader, e = document.createElement("link");
        e.type = "text/css";
        e.rel  = "stylesheet";
        e.href = "fadePics.css";
        document.getElementsByTagName("head")[0].appendChild(e);

        fader = this.inits;
        delete this.inits;
        for (i = 0; i < fader.length; i++) {
            this.init(fader[i]);
        }
    },

    Fader: function(einstellungen) {
        if ( ! einstellungen.id ||  ! document.getElementById(einstellungen.id) || FadePic.faders[einstellungen.id] || einstellungen.images.length < 2) {
            return false;
        }
        var i, original = document.getElementById(einstellungen.id);

        this.id = einstellungen.id;
        this.images = new Array();
        this.counter = false;

        this.element = document.createElement("span");
        this.element.className = "fader";
        original.parentNode.replaceChild(this.element, original);

        var Nr = new Array();
        while (Nr.length < einstellungen.images.length) {
            ok = true;
            r = Math.floor(Math.random() * (einstellungen.images.length));
            for (i = 0; i < Nr.length; i++) {
                if (r == Nr[i]) ok = false;
            }
            if (ok) Nr[Nr.length] = r;
        }

        for (i = 0; i < einstellungen.images.length; i++) {
            this.images[i] = document.createElement("img");
            this.images[i].src = einstellungen.images[Nr[i]];
            this.images[i].alt = "Bild";
            if (i == 0) {
                this.element.appendChild(this.images[i]);
            }
        }
        
        this.fade = function(step) {
            var fader = this, imgs = this.element.getElementsByTagName("img");

            step = ( ! step) ? 0 : step;

            imgs[1].style.opacity = step/100;
            imgs[1].style.filter = "alpha(opacity=" + step + ")"; // IE?

            step += 0.75;

            if (step <= 100) {
                window.setTimeout(function() { fader.fade(step); }, 1);
            } else {
                imgs[1].className = "";
                this.element.removeChild(imgs[0]);
                window.setTimeout(function() { fader.next(); }, 1800);
            }
        };

        this.next = function() {
            this.counter = (this.counter < this.images.length - 1) ? this.counter + 1 : 0;
            this.element.appendChild(this.images[this.counter]);
            this.images[this.counter].className = "next";
            this.fade();
        };
    }
};

FadePic.start();