(function($) {
	$.elementsLength;
	$.current = 1;
	$.last = 0;
	$.timer = null;

    $.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") {
                $.timer = setTimeout(function() {
                    $.innerfade.next(elements, settings, 1, 0);
                }, settings.timeout);
                $(elements[0]).show();
            }
		}
		
		$.elementsLength = elements.length;
		
		$('#slide-left').click(function(event) {
			event.preventDefault();
			clearTimeout($.timer);
            if (($.current + 1) < $.elementsLength) { $.current = $.current + 1; $.last = $.current - 1; }
            else { $.current = 0; $.last = $.elementsLength - 1; }
            if ($.last == 0) { $.last = $.elementsLength - 1; }
            else { $.last--; } 
			$.innerfade.next(elements, settings, $.current, $.last);
		});
		
		$('#slide-right').click(function(event) {
			event.preventDefault();
			clearTimeout($.timer);
            if (($.current - 1) < $.elementsLength) { $.current = $.current + 1; $.last = $.current - 1; }
            else { $.current = 0; $.last = $.elementsLength - 1; }
            $.current--;
            if ($.last > 0) { $.last--; }
            else { $.last = $.elementsLength - 1; }
			$.innerfade.next(elements, settings, $.current, $.last);
		});
    };

    $.innerfade.next = function(elements, settings, current, last) {
        if (settings.animationtype == 'fade') {
            $(elements[last]).fadeOut(settings.speed);
            $(elements[current]).fadeIn(settings.speed, function() {
				removeFilter($(this)[0]);
			});
        }
        if (settings.type == "sequence") {
            if ((current + 1) < elements.length) { current = current + 1; last = current - 1; }
            else { current = 0; last = elements.length - 1; }
            
            $.current = current;
            $.last = last;
            $.innerfade.updateLabel(last);
        }
        $.timer = setTimeout((function() {
            $.innerfade.next(elements, settings, current, last);
        }), settings.timeout);
    };
    
    $.innerfade.updateLabel = function(index) {
    	$('#slide-index').children('span').each(function(el) {
			if (el == index) { $(this).addClass('slide-active-index'); }
			else { $(this).removeClass('slide-active-index'); }
    	});
    };

})(jQuery);

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