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

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

    $.innerfade.next = function() {
	
        if (innerfadeSettings.animationtype == 'slide') {
            $(innerfadeElements[innerfadeLast]).slideUp(innerfadeSettings.speed);
            $(innerfadeElements[innerfadeCurrent]).slideDown(innerfadeSettings.speed);
        } else if (innerfadeSettings.animationtype == 'fade') {
            $(innerfadeElements[innerfadeLast]).fadeOut(innerfadeSettings.speed);
            $(innerfadeElements[innerfadeCurrent]).fadeIn(innerfadeSettings.speed, function() {
							removeFilter($(this)[0]);
						});
        } else
            alert('Innerfade-animationtype must either be \'slide\' or \'fade\'');
		
		if (innerfadeSettings.type == "sequence") {
            if ((innerfadeCurrent + 1) < innerfadeElements.length) {
                innerfadeCurrent = innerfadeCurrent + 1;
                innerfadeLast = innerfadeCurrent - 1;
            } else {
                innerfadeCurrent = 0;
                innerfadeLast = innerfadeElements.length - 1;
            }
        } else if (innerfadeSettings.type == "random") {
            innerfadeLast = innerfadeCurrent;
            while (innerfadeCurrent == innerfadeLast)
                innerfadeCurrent = Math.floor(Math.random() * innerfadeElements.length);
        } else
            alert('Innerfade-Type must either be \'sequence\', \'random\' or \'random_start\'');

		$.innerfade.nextTimer();
	};
	
	$.innerfade.nextTimer = function() {
	
		clearTimeout(innerfadeTimer);
	
        innerfadeTimer = setTimeout((function() {
            $.innerfade.next();
        }), innerfadeSettings.timeout);
    };
	
	$.innerfade.stop = function() {
		clearTimeout(innerfadeTimer);
	}
	
	$.innerfade.start = function() {
		$.innerfade.nextTimer();
	}
	
	$.innerfade.showNext = function() {
		$.innerfade.next();
	};
	
	$.innerfade.showPrevious = function() {
		innerfadeCurrent = innerfadeLast - 1;
		if ( innerfadeCurrent < 0 ) {
			innerfadeCurrent = innerfadeElements.length - 1;
		}
		
		$.innerfade.next();
	};
	

})(jQuery);

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