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

// 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)
 *  }); 
 *
// Modified By: Guang Yan Wang

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


(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',
            'control':          '#control li span',
            'selectedclass':    'selected',
            '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) {
        
            $(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") {
                $.each(elements, function(i, n) {
                    $(n).click(function() {                        
                        if ((i + 1) < elements.length) {
                            current = i + 1;
                            last = i;
                        } else {
                            current = 0;
                            last = elements.length - 1;
                        }
                        
                        $.innerfade.get(elements, settings, current, last);
                        clearTimeout(timeOut);
                        
                    }).css('cursor', 'pointer');
                });
                
                $.each($(settings.control), function(i, n) {
                    $(n).click(function() {                                     
                        $.each(elements, function (i) {
                            if($(this).hasClass('current')) {
                                last = i;
                            }
                        });                        
                                       
                        if (i > 0) {
                            current = i;
                        } else {
                            current = 0;
                        }

                        $.innerfade.get(elements, settings, current, last);
                        clearTimeout(timeOut);                      
                                   
                    }).css('cursor', 'pointer');;            
                });
            
                timeOut = setTimeout(function() {
                    $.innerfade.next(elements, settings, 1, 0);
                }, settings.timeout);
                $(elements[0]).show().addClass('current');
                
            } else if (settings.type == "random") {
            		var last = Math.floor ( Math.random () * ( elements.length ) );
                timeOut = 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 ) );
								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\'');
						}            
				}
        else {
          $(elements[0]).show().addClass('current');
        }
    };

    $.innerfade.next = function(elements, settings, current, last) {
        //alert('func: next $last: '+last+' $current :'+current);
        
        if (settings.animationtype == 'slide') {
            $(elements[last]).slideUp(settings.speed).removeClass('current');
            $(elements[current]).slideDown(settings.speed).addClass('current');
        } else if (settings.animationtype == 'fade') {
            $(elements[last]).fadeOut(settings.speed).removeClass('current');
            $(elements[current]).fadeIn(settings.speed, function() {
							removeFilter($(this)[0]);
						}).addClass('current');
        } else
            alert('Innerfade-animationtype must either be \'slide\' or \'fade\'');
        if (settings.type == "sequence") {
            $(settings.control).removeClass(settings.selectedclass);                        
            $(settings.control).eq(current).addClass(settings.selectedclass);
        
            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\'');
        
        timeOut = setTimeout((function() {
            $.innerfade.next(elements, settings, current, last);
        }), settings.timeout);
    };
    
    $.innerfade.get = function(elements, settings, current, last) {
        //alert('func: get $last: '+last+' $current :'+current);
        
        if (settings.animationtype == 'slide') {
            $(elements[last]).slideUp(settings.speed).removeClass('current');
            $(elements[current]).slideDown(settings.speed).addClass('current');
        } else if (settings.animationtype == 'fade') {
            $(elements[last]).fadeOut(settings.speed).removeClass('current');
            $(elements[current]).fadeIn(settings.speed, function() {
              removeFilter($(this)[0]);
            }).addClass('current');
        } else
            alert('Innerfade-animationtype must either be \'slide\' or \'fade\'');
            
        $(settings.control).removeClass(settings.selectedclass);                        
        $(settings.control).eq(current).addClass(settings.selectedclass);
    };

})(jQuery);

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