// =========================================================

// jq-innerfade.js

// Datum: 2006-09-01
// Firma: Medienfreunde Hofmann & Baldes GbR
// Autor: Torsten Baldes
// Mail: t.baldes@medienfreunde.com
// Web: http://medienfreunde.com

// based on the work of Matt Oakes http://portfolio.gizone.co.uk/applications/slideshow/

// =========================================================


$.fn.innerfade = function(options) {
    return this.each(function() {

        var settings = {
            speed: 'normal',
            timeout: 2000,
            type: 'sequence',
            containerheight: 'auto'
        }

        if (options)
            $.extend(settings, options);

        var elements = $(this).children().get();

        if (elements.length > 1) {

            $(this).parent().css('position', 'relative');

            $(this).css('height', settings.containerheight);

            for (var i = 0; i < elements.length; i++) {
                $(elements[i]).css('z-index', elements.length - i).css('position', 'absolute');
                $(elements[i]).hide();
            }

            if (settings.type == 'sequence') {
                setTimeout(function() {
                    $.innerfade.next(elements, settings, 1, 0);
                }, settings.timeout);
                $(elements[0]).show();
            }
            else if (settings.type == 'random') {
                setTimeout(function() {
                    do { current = Math.floor(Math.random() * (elements.length)); } while (current == 0)
                    $.innerfade.next(elements, settings, current, 0);
                }, settings.timeout);
                $(elements[0]).show();
            }
            else if (settings.type == 'one') {
                do { current = Math.floor(Math.random() * (elements.length)); } while (current == 0)
                $.innerfade.next(elements, settings, current, 0);
            }
            else {
                alert('type must either be \'sequence\' or \'random\' or \'one\'');
            }

        }

    });
};


$.innerfade = function() {}
$.innerfade.next = function(elements, settings, current, last) {

    $(elements[last]).fadeOut(settings.speed);
    $(elements[current]).fadeIn(settings.speed);

    if (settings.type == 'sequence') {
        if ((current + 1) < elements.length) {
            current = current + 1;
            last = current - 1;
        }
        else {
            current = 0;
            last = elements.length - 1;
        }
    }
    else if (settings.type == 'random') {
        last = current;
        while (current == last) {
            current = Math.floor(Math.random() * (elements.length));
        }
    }
    else if (settings.type == 'one') {
        last = current;
    }
    else {
        alert('type must either be \'sequence\' or \'random\'');
    }
    if (settings.type == 'random' || settings.type == 'sequence') {
        setTimeout((function() { $.innerfade.next(elements, settings, current, last); }), settings.timeout);
    }
}