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

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

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

	$.innerfade = function(container, options) {
		if($(container).data('settings')){
			var settings = $(container).data('settings');
		}else{
			var settings = {
				'animationtype':    'fade',
				'speed':            'normal',
				'type':             'sequence',
				'timeout':          2000,
				'containerheight':  'auto',
				'runningclass':     'innerfade',
				'children':         null,
				'onchange': function(c){ void(0); }
			};
			if (options) $.extend(settings, options);
			$(container).data('settings', settings);
		}

		if (settings.children === null){
			var elements = $(container).children();
		} else {
			var elements = $(container).children(settings.children);
		}

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

	$.innerfade.next = function(container, elements, settings, next) {
		$(elements).css('opacity','').stop();
		if (settings.animationtype == 'slide') {
			$(elements).filter('.current').removeClass('current').animate({top: '-'+settings.containerheight },settings.speed, function(){
				$(this).hide();
			});
			$(elements[next]).addClass('current').css({top: settings.containerheight }).show().animate({top: 0 },settings.speed);
			settings.onchange(next);
		} else if (settings.animationtype == 'fade') {
			$(elements).filter('.current').removeClass('current').fadeOut(settings.speed);
			$(elements[next]).addClass('current').fadeIn(settings.speed, function() {
				removeFilter($(this)[0]);
			});
			settings.onchange(next);
		} else {
			alert('Innerfade-animationtype must either be \'slide\' or \'fade\'');
		}
		var nxt = next;
		if (settings.type == "sequence") {
			nxt = (next + 1) < elements.length? next + 1 : 0;
		} else if (settings.type == "random") {
			while (nxt == next){
				nxt = Math.floor(Math.random() * elements.length);
			}
		} else {
			alert('Innerfade-Type must either be \'sequence\', \'random\' or \'random_start\'');
		}
		clearTimeout(container.tout);
		container.tout = setTimeout((function() {
			$.innerfade.next(container, elements, settings, nxt);
		}), settings.timeout);
	};

})(jQuery);