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

// 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': 			4000,
			'containerheight': 	'auto',
			'runningclass': 	'innerfade',
			'children': 		null,
			'path': 			null,
			'images': 			null
		};
		if (options)
			$.extend(settings, options);
		if (settings.images !== null) {
			var imageOptions = {
				'path': 	(settings.path === null) ? '' : settings.path,
				'images': 	settings.images
			}
			insertImages(container, imageOptions);
		}
		if (settings.children === null)
			var elements = $(container).children();
		else
			var elements = $(container).children(settings.children);
		if (settings.containerheight === "auto")
			settings.containerheight = $(container).height();
		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\'');
		setTimeout((function() {
			$.innerfade.next(elements, settings, current, last);
		}), settings.timeout);
	};

	function insertImages(container, options) {
		var settings = {
			'path': 	'',
			'images': 	[]
		};
		if (options)
			$.extend(settings, options);
		$(container).empty();
		jQuery.each(settings.images, function(index, image) {
			$(container).append('<img src="'+settings.path+this+'" alt="innerfade" />');
		});
	}

	function removeFilter(element) {
		if(element.style.removeAttribute){
			element.style.removeAttribute('filter');
		}
	}

})(jQuery);

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