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

// 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);
		});
	};

	// Manipulators shortcuts
	$.fn.innerfadeNext = function() {
		return this.each(function() {   
			$.innerfade.next(this);
		});
	};
	$.fn.innerfadePrev = function() {
		return this.each(function() {   
			$.innerfade.prev(this);
		});
	};
	$.fn.innerfadeShowIndex = function(index) {
		return this.each(function() {
			$.innerfade.showIndex(this, index);
		});
	};

	$.innerfade = function(container, options) {
		var settings = {
			'animationtype':    'fade',
			'speed':            'normal',
			'type':             'sequence',
			'timeout':          2000,
			'containerheight':  'auto',
			'runningclass':     'innerfade',
			'children':         null,
			'onChange': null
		};
		if (options) {
			$.extend(settings, options);
		}
		$.extend(settings, {
			'elements': null,
			'current': 0,
			'last': 0,
			'timeoutId': null
		});

		container.__innerfadeParams = settings;

		if (settings.children === null) {
			settings.elements = $(container).children();
		} else {
			settings.elements = $(container).children(settings.children);
		}
		if (settings.elements.length > 1) {
			$(container).css('position', 'relative').css('height', settings.containerheight).addClass(settings.runningclass);
			for (var i = 0; i < settings.elements.length; i++) {
				$(settings.elements[i]).css('z-index', String(settings.elements.length-i)).css('position', 'absolute').hide();
			};
			if (settings.type == "sequence") {
				settings.last = 0;
				settings.current = 1;
			} else if (settings.type == "random") {
				settings.last = Math.floor ( Math.random () * ( settings.elements.length ) );
				do {
					settings.current = Math.floor ( Math.random ( ) * ( settings.elements.length ) );
				} while (settings.last == settings.current );
			} else if ( settings.type == 'random_start' ) {
				settings.type = 'sequence';
				settings.last = Math.floor ( Math.random () * ( settings.elements.length ) );
				settings.current = (settings.last + 1) % settings.elements.length;
			}	else {
				alert('Innerfade-Type must either be \'sequence\', \'random\' or \'random_start\'');
				return null;
			}
			settings.timeoutId = setTimeout(function(){
				$.innerfade.displayNext(settings);
			}, settings.timeout);
			$(settings.elements[settings.last]).show();
		}
	};

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

		if(settings.onChange){
			settings.onChange(settings);
		}

		settings.last = settings.current;
		if (settings.type == "sequence") {
			settings.current = (settings.current + 1) % settings.elements.length;
		} else if (settings.type == "random") {
			while (settings.current == settings.last) {
				settings.current = Math.floor(Math.random() * settings.elements.length);
			}
		} else{
			alert('Innerfade-Type must either be \'sequence\', \'random\' or \'random_start\'');
		}
		settings.timeoutId = setTimeout((function() {
			$.innerfade.displayNext(settings);
		}), settings.timeout);
	};

	// Manipulators
	$.innerfade.next = function(container) {
		if(container.__innerfadeParams){
			$.innerfade.showIndex(container, container.__innerfadeParams.current);
		}
	};
	$.innerfade.prev = function(container) {
		if(container.__innerfadeParams){
			var settings = container.__innerfadeParams;
			$.innerfade.showIndex(
				container,
				settings.last ? (settings.last - 1) : (settings.elements.length - 1)
			);
		}
	};
	$.innerfade.showIndex = function(container, index) {
		if(container.__innerfadeParams){
			var settings = container.__innerfadeParams;
			settings.current = index % settings.elements.length;
			clearTimeout(settings.timeoutId);
			$.innerfade.displayNext(settings);
		}
	};
})(jQuery);

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