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

// 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':            'normal',
            'type':             'sequence',
            'timeout':          2000,
            'containerheight':  'auto',
            'runningclass':     'innerfade',
            'children':         null,
            'continuation': true
        };
        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();
            };
            if (settings.type == "sequence") {
                setTimeout(function() {
                    $.innerfade.next(elements, settings, 1, 0);
                }, settings.timeout);
                $(elements[0]).show();
            } else if (settings.type == "random") {
                        var last = Math.floor ( Math.random () * ( elements.length ) );
                setTimeout(function() {
                    do {
                                                                                                current = Math.floor ( Math.random ( ) * ( elements.length ) );
                                                                                } while (last == current );
                                                                                $.innerfade.next(elements, settings, current, last);
                }, settings.timeout);
                $(elements[last]).show();
                                                } else if ( settings.type == 'random_start' ) {
                                                                settings.type = 'sequence';
                                                                var current = Math.floor ( Math.random () * ( elements.length ) );
                                                                setTimeout(function(){
                                                                        $.innerfade.next(elements, settings, (current + 1) %  elements.length, current);
                                                                }, settings.timeout);
                                                                $(elements[current]).show();
                                                }       else {
                                                        alert('Innerfade-Type must either be \'sequence\', \'random\' or \'random_start\'');
                                                }
                                }
    };

    $.innerfade.next = function(elements, settings, current, last) {
        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 (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
            alert('Innerfade-Type must either be \'sequence\', \'random\' or \'random_start\'');


        if(! settings.continuation && (current == 0)) {
          return false;
        }
        setTimeout((function() {
            $.innerfade.next(elements, settings, current, last);
        }), settings.timeout);
    };

})(jQuery);

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