/* =========================================================
// 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
	};
	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\'');
	}
	
	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');
	}
}