/* =========================================================

 // jquery.innerfade.js

 // Datum: 2008-02-14
 // Firma: Medienfreunde Hofmann & Baldes GbR
 // Author: 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/
 // and Ralf S. Engelschall http://trainofthoughts.org/

 *
 *  <ul id="news"> 
 *      <li>content 1</li>
 *      <li>content 2</li>
 *      <li>content 3</li>
 *  </ul>
 *  
 *  $('#news').innerfade({ 
 *	  animationtype: Type of animation 'fade' or 'slide' (Default: 'fade'), 
 *	  speed: Fading-/Sliding-Speed in milliseconds or keywords (slow, normal or fast) (Default: 'normal'), 
 *	  timeout: Time between the fades in milliseconds (Default: '2000'), 
 *	  type: Type of slideshow: 'sequence', 'random' or 'random_start' (Default: 'sequence'), 
 * 	  containerheight: Height of the containing element in any css-height-value (Default: 'auto'),
 *	  runningclass: CSS-Class which the container get’s applied (Default: 'innerfade'),
 *	  children: optional children selector (Default: null)
 *  }); 
 *

 // ========================================================= */


(function($) {

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

    $.innerfade = function(container, options) {
        var settings = {
            'animationtype':    'fade',
            'speed':            '1000',
            'type':             'sequence',
            'timeout':          2000,
            'containerheight':  'auto',
            'runningclass':     'innerfade',
            'children':         null
        };

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

        if (settings.children === null)
            var elements = $(container).children();
        else
            var elements = $(container).children(settings.children);

        if (elements.length > 1) {
            $(container).css('position', 'relative').css('height', settings.containerheight).addClass(settings.runningclass);
            for (var i = 0; i < elements.length; i++) {
                $(elements[i]).css('z-index', String(elements.length - i)).css('position', 'absolute').hide();
            };

            var tid =
                setTimeout(function() {
                        $.innerfade.next(elements, settings, 1, 0, container);
                    }, settings.timeout);

            $.data(container, "fadevals", { opts: settings, current: 0, last: elements.length-1, timeoutid: tid });

            $(elements[0]).show();
        }
    };

    $.innerfade.next = function(elements, settings, current, last, container) {
        if (settings.animationtype == 'slide') {
            $(elements[last]).slideUp(settings.speed);
            $(elements[current]).slideDown(settings.speed);
        } else if (settings.animationtype == 'fade') {
            $(elements[last]).fadeOut(settings.speed);
            $(elements[current]).fadeIn(settings.speed, function() {
                removeFilter($(this)[0]);
            });
        } else
            alert('Innerfade-animationtype must either be \'slide\' or \'fade\'');

        if ((current + 1) < elements.length) {
            current = current + 1;
            last = current - 1;
        } else {
            current = 0;
            last = elements.length - 1;
        }

        var tid =
            setTimeout((function() {
                $.innerfade.next(elements, settings, current, last, container);
            }), settings.timeout);
        $.data(container, "fadevals").timeoutid = tid;

    };

    $.fn.back = function() {
        var fdvals = $.data($(this)[0], "fadevals");
        clearTimeout(fdvals.timeoutid);
        var elements = $(this).children();

        if ((fdvals.current - 1) >= 0) {
            fdvals.last = fdvals.current;
            fdvals.current -= 1;
        } else {
            fdvals.current = elements.length - 1;
            fdvals.last = 0;
        }

        $.innerfade.next(
                elements,
                fdvals.opts,
                fdvals.current,
                fdvals.last,
                $(this)[0]);
    };

    $.fn.fwd = function() {
        var fdvals = $.data($(this)[0], "fadevals");
        clearTimeout(fdvals.timeoutid);
        var elements = $(this).children();

        if ((fdvals.current + 1) < elements.length) {
            fdvals.current += 1;
            fdvals.last = fdvals.current - 1;
        } else {
            fdvals.current = 0;
            fdvals.last = elements.length - 1;
        }

        $.innerfade.next(
                elements,
                fdvals.opts,
                fdvals.current,
                fdvals.last,
                $(this)[0]);
    };


})(jQuery);

// **** remove Opacity-Filter in ie ****
function removeFilter(element) {
    if (element.style.removeAttribute) {
        element.style.removeAttribute('filter');
    }
}