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

// 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 iFade_Elements;
	var iFade_Settings;
	var iFade_NaviElements;
	var iFade_Current=0;
	var iFade_Last=0;
	var iFade_TimerID;

	var naviOnImg = "common/image/dot_on.gif";
	var naviOffImg = "common/image/dot_off.gif";

    $.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,
			'naviElelmnts':		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") {
				iFade_TimerID = 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 ) );
				iFade_TimerID = 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 ) );
				iFade_TimerID = 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\'');
			}
		}
		
		iFade_Elements = elements;
		iFade_Settings = settings;
		
		iFade_NaviElements = null;
		if (settings.naviElelmnts === null){
		}else{
			var naviElements = settings.naviElelmnts.children();
			iFade_NaviElements = new Array(naviElements.length);
			for (var j = 0; j < naviElements.length; j++) {
				iFade_NaviElements[j] = naviElements[j].getElementsByTagName("img")[0]
			};
		}

    };

	$.innerfade.next = function(elements, settings, current, last) {
		if (settings.naviElelmnts === null){
		}else{
			iFade_NaviElements[last].src = naviOffImg;
			iFade_NaviElements[current].src = naviOnImg;
		}
				
		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\'');
			iFade_TimerID = setTimeout((function() {
				$.innerfade.next(elements, settings, current, last);
				}), settings.timeout);

		iFade_Current = current;
		iFade_Last = last;

	};


	$.innerfade.jump = function(next) {
		if (next < 1 || next > iFade_Elements.length) {
			alert('Innerfade next index is invalid.');
		}
		
		next--;
		
		if(next != iFade_Last)
		{
			if (iFade_NaviElements === null){
			}else{
				iFade_NaviElements[iFade_Last].src = naviOffImg;
				iFade_NaviElements[next].src = naviOnImg;
			}
				
			clearTimeout(iFade_TimerID);
			$.innerfade.next(iFade_Elements, iFade_Settings, next, iFade_Last);
		}
	};


})(jQuery);

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