(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);
			}
			
			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', 0).css('position', 'absolute').hide();
				}
				
				if(settings.type == "sequence")
				{
					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));
					
					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\'');
				}
			}
		};

    $.innerfade.next = function(elements, settings, current, last)
	{
        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\'');
		}
		
		setTimeout((function()
			{
            	$.innerfade.next(elements, settings, current, last);
        	}), settings.timeout);
    };
})(jQuery);

//verwijder Opacity-Filter in IExplorer
function removeFilter(element)
{
	if(element.style.removeAttribute)
	{
		element.style.removeAttribute('filter');
	}
}