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

// 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':          4000,
            '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) {
			$.innerfade.timeout = settings.timeout;
            $(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();
				  $(elements[i]).css('z-index', '0').css('position', 'absolute').hide();
            };
            if (settings.type == "sequence") {
                $.innerfade.queueTask(elements, settings, 1, 0);
                $(elements[0]).show();
            } else if (settings.type == "random") {
        		var last = Math.floor ( Math.random () * ( elements.length ) );	
				do { 
					current = Math.floor ( Math.random ( ) * ( elements.length ) );
				} 
				while (last == current );
				$.innerfade.queueTask(elements, settings, current, last);  				
            	$(elements[last]).show();
			} else if ( settings.type == 'random_start' ) {
				settings.type = 'sequence';
				var current = Math.floor ( Math.random () * ( elements.length ) );
				$.innerfade.queueTask(elements, settings, (current + 1) %  elements.length, current);				
				$(elements[current]).show();
			} else {
				alert('Innerfade-Type must either be \'sequence\', \'random\' or \'random_start\'');
		    }
		}
    };
	
	$.innerfade.queueTask = function(elements, settings, current, last){
		$.innerfade.currentItem = $(elements[last]);		
		$.innerfade.currentTask = function() {
          	$.innerfade.timeoutID = $.innerfade.next(elements, settings, current, last);
          };  
		$.innerfade.timeoutID = setTimeout($.innerfade.currentTask, $.innerfade.timeout);
	};
	
	
    $.innerfade.pause = function(interuptId){        
		$.innerfade.interruptItem = $('#'+interuptId);
		if($.innerfade.interruptItem == null){
			return; //fail silently if errouneous id
		}		
		clearTimeout($.innerfade.timeoutID);
		
		if($.innerfade.currentItem != null)						
			$.innerfade.currentItem.hide();
				
		$.innerfade.interruptItem.show();
	};
	
	$.innerfade.resume = function(){		
		if($.innerfade.interruptItem != null)
			$.innerfade.interruptItem.hide();
		$.innerfade.interruptItem = null;
		
		if($.innerfade.currentItem != null)
			$.innerfade.currentItem.show();
			
		$.innerfade.timeoutID = setTimeout($.innerfade.currentTask, $.innerfade.timeout); //requeue next text
	};

    $.innerfade.next = function(elements, settings, current, last) {
		if(typeof($.innerfade.interruptItem) != 'undefined' && $.innerfade.interruptItem != null)		
			return;    // just in case something does get queued, we're not allowed to do anything while there's an interrupt  
			
		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\'');
        
		/** singleton-only hooks to allow pause and resume to work **/
		$.innerfade.queueTask(elements, settings, current, last);
    };

})(jQuery);

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