(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', String(elements.length-i)).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();
				$("#imgAreaText P").html($($(elements[current]).children()).attr("alt"));
			} 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);
			$("#imgAreaText P").fadeOut(settings.speed - 1500, function() {
				replaceText(elements[last]);
			});
			$(elements[current]).fadeIn(settings.speed, function() {
				removeFilter($(this)[0]);
			});
			$("#imgAreaText P").fadeIn(settings.speed - 1500);
			
		} 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);

function replaceText(element) {
	$("#imgAreaText P").html($($(element).children()).attr("alt"));
}

function removeFilter(element) {
	if (element.style.removeAttribute) {
		element.style.removeAttribute('filter');
	}
}