(function($) {

    var settings = {
            'animationtype':    'fade',
            'pages':            null,
            'speed':            'normal',
            'type':             'sequence',
            'timeout':          2000,
            'containerheight':  'auto',
            'runningclass':     'innerfade'
        };

    var timer = null;
    var use_timer = true;
    var last = 0;
    var elements = null;

    $.fn.innerfade = function(options) {
        return this.each(function() {
            $.innerfade(this, options);
        });
    };

    $.innerfade = function(container, options) {
        if (options)
            $.extend(settings, options);
        elements = $(container).children();
        if (elements && 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") {
                $.innerfade.pages(elements, settings);
                timer = setTimeout(function() {
                    $.innerfade.next(elements, settings, 1);
                }, settings.timeout);
                $(elements[0]).show();
            }
        }
    };

    //generate pages based on news blocks number
    $.innerfade.pages = function(elements, settings) {
        var html = "";
        for(var i=0;i<elements.length;i++) {
            html += "<a href='#' onclick='$(\"#" + elements.parent()[0].id + "\").slide(this);return false;' " +(i==0 ? "class='on'" : "class='off'")+ ">" + (i + 1) + "</a>";
        }
        html += "<div class='clear'><!--//--></div>";
        $('#' + settings.pages).html(html);
    }

    //change news blocks on mouse click event
    $.fn.slide = function(node) {
        return this.each(function() {
            var current = $('#' + settings.pages + ' a').index(node);
            clearTimeout(timer);
            use_timer = false;
            $.innerfade.next(elements, settings, current);
        });
    };

    $.innerfade.next = function(elements, settings, current) {
        if (settings.animationtype == 'fade') {
            setPagerClass($('#' + settings.pages).children(), current, last);
            $(elements[last]).fadeOut(settings.speed);
            $(elements[current]).fadeIn(settings.speed, function() {
                                                                removeFilter($(this)[0]);
                                });
        } else
            alert('Innerfade-animationtype must either be \'fade\'');
        if (settings.type == "sequence") {
            if ((current + 1) < elements.length) {
                current = current + 1;
                last = current - 1;
            } else {
                current = 0;
                last = elements.length - 1;
            }
        } else
            alert('Innerfade-Type must either be \'sequence\'');
        if (use_timer)
        {
            timer = setTimeout((function() {
                $.innerfade.next(elements, settings, current);
            }), settings.timeout);
        }
    };


})(jQuery);

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

// **** change Active Page style ****
function setPagerClass(node, current, last) {
     node[current].className="on";
     node[last].className="off";
}