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

// 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>
 *  
 *  jQuery('#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(jQuery) {

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

        jQuery.innerfade = function(container, options) {
                var settings = {
                                'animationtype':        'fade',
                        'speed':                        'normal',
                        'type':                  'sequence',
                        'timeout':                2000,
                        'containerheight':  'auto',
                        'runningclass':  'innerfade',
                        'children':              null
                };
                if (options)
                        jQuery.extend(settings, options);
                if (settings.children === null)
                        var elements = jQuery(container).children();
                else
                        var elements = jQuery(container).children(settings.children);
                if (elements.length > 1) {
                        jQuery(container).css('position', 'relative').css('height', settings.containerheight).addClass(settings.runningclass);
                        for (var i = 0; i < elements.length; i++) {
                                jQuery(elements[i]).css('z-index', String(elements.length-i)).css('position', 'absolute').hide();
                        };
                        if (settings.type == "sequence") {
                                setTimeout(function() {
                                        jQuery.innerfade.next(elements, settings, 1, 0);
                                }, settings.timeout);
                                jQuery(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 );                      
                                                                                jQuery.innerfade.next(elements, settings, current, last);
                                }, settings.timeout);
                                jQuery(elements[last]).show();
                                                } else if ( settings.type == 'random_start' ) {
                                                                settings.type = 'sequence';
                                                                var current = Math.floor ( Math.random () * ( elements.length ) );
                                                                setTimeout(function(){
                                                                        jQuery.innerfade.next(elements, settings, (current + 1) %  elements.length, current);
                                                                }, settings.timeout);
                                                                jQuery(elements[current]).show();
                                                }       else {
                                                        alert('Innerfade-Type must either be \'sequence\', \'random\' or \'random_start\'');
                                                }
                                }
        };

        jQuery.innerfade.next = function(elements, settings, current, last) {
                if (settings.animationtype == 'slide') {
                        jQuery(elements[last]).slideUp(settings.speed);
                        jQuery(elements[current]).slideDown(settings.speed);
                } else if (settings.animationtype == 'fade') {
                        jQuery(elements[last]).fadeOut(settings.speed);
                        jQuery(elements[current]).fadeIn(settings.speed, function() {
                                                        removeFilter(jQuery(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\'');
                setTimeout((function() {
                        jQuery.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');
        }
}