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

// 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($) {

        var settings = [{
			'id':				null,
        	'animationtype':    'fade',
            'speed':            'normal',
            'type':             'sequence',
            'timeout':          2000,
            'containerheight':  'auto',
            'runningclass':     'innerfade',
            'children':         null,
			'timeron': 			'yes',
			'pause_button_id': 	null,
			'last':				0,
			'timer':			null
        }, {
			'id':				null,
        	'animationtype':    'fade',
            'speed':            'normal',
            'type':             'sequence',
            'timeout':          2000,
            'containerheight':  'auto',
            'runningclass':     'innerfade',
            'children':         null,
			'timeron': 			'yes',
			'pause_button_id': 	null,
			'last':				0,
			'timer':			null
        }];
		
    $.fn.innerfade = function(options, index) {
        return this.each(function() {   
            $.innerfade(this, options, index);
        });
    };

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

    $.innerfade.next = function(elements, index, current, last) {
		if (settings[index].timeron == 'yes') {
			if (settings[index].animationtype == 'slide') {
				$(elements[last]).slideUp(settings[index].speed);
				$(elements[current]).slideDown(settings[index].speed);
			} else if (settings[index].animationtype == 'fade') {
				$(elements[last]).fadeOut(settings[index].speed);
				$(elements[current]).fadeIn(settings[index].speed, function() {
								removeFilter($(this)[0]);
							});
			} else
				alert('Innerfade-animationtype must either be \'slide\' or \'fade\'');
			if (settings[index].type == "sequence") {
				if ((current + 1) < elements.length) {
					current = current + 1;
					last = current - 1;
				} else {
					current = 0;
					last = elements.length - 1;
				}
			} else if (settings[index].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\'');
			settings[index].timer = setTimeout((function() {
				$.innerfade.next(elements, index, current, last);
			}), settings[index].timeout);
			settings[index].last = last;
		}
    };

	$.pause = function(index) {
    	var elements = $("ul#"+settings[index].id +" li");

		if (settings[index].timeron == 'no') { //play
			settings[index].timeron = 'yes';
			settings[index].timer = setTimeout((function() {
				$.innerfade.next(elements, index, getNext(elements, settings[index].last), settings[index].last);
			}), 0);
			$("#"+settings[index].pause_button_id).attr("class", "pause_button");
		} else { // pause
			settings[index].timeron = 'no';
			$("#"+settings[index].pause_button_id).attr("class", "play_button");
		}
	};
	
	$.prev = function(index) {
		clearTimeout(settings[index].timer);
    	var elements = $("ul#"+settings[index].id +" li");
		var last = settings[index].last;
		var prev = getPrev(elements, last);
		if (settings[index].animationtype == 'slide') {
			$(elements[last]).slideUp(settings[index].speed);
			$(elements[prev]).slideDown(settings[index].speed);
		} else if (settings[index].animationtype == 'fade') {
			$(elements[last]).fadeOut(settings[index].speed);
			$(elements[prev]).fadeIn(settings[index].speed, function() {
							removeFilter($(this)[0]);
						});
		} else
			alert('Innerfade-animationtype must either be \'slide\' or \'fade\'');
		
		settings[index].timer = setTimeout((function() {
				$.innerfade.next(elements, index, getNext(elements, settings[index].last), prev);
			}), settings[index].timeout);
		settings[index].last = prev;
		
	}
	
	
	$.next = function(index) {
		clearTimeout(settings[index].timer);
    	var elements = $("ul#"+settings[index].id +" li");
		var last = settings[index].last;
		var next = getNext(elements, last);
		if (settings[index].animationtype == 'slide') {
			$(elements[last]).slideUp(settings[index].speed);
			$(elements[next]).slideDown(settings[index].speed);
		} else if (settings[index].animationtype == 'fade') {
			$(elements[last]).fadeOut(settings[index].speed);
			$(elements[next]).fadeIn(settings[index].speed, function() {
							removeFilter($(this)[0]);
						});
		} else
			alert('Innerfade-animationtype must either be \'slide\' or \'fade\'');
			
		settings[index].timer = setTimeout((function() {
		$.innerfade.next(elements, index, getNext(elements, settings[index].last), next);
			}), settings[index].timeout);
		settings[index].last = next;	
		
	
	}
	
	
})(jQuery);

function getNext(element, index) {
	if (index+1 == element.length)
		return 0;
	else
		return index + 1;
}
function getPrev(element, index) {
	if (index == 0)
		return element.length-1;
	else
		return index - 1;
}

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