jQuery(document).ready(function () {

    splitinul();
    elementscount();

    jQuery("#logo_slider .center_logo_slider_menu_part ul:first").css('display', 'block');

    referenzinterval = setInterval(function () {
        rotate();
    }, 5000);

});

function splitinul() {

    var allElements = jQuery('#logo_slider .center_logo_slider_menu_part li');
    WRAP_BY = 4;
    var y = 0;
    for (var i = 0; i < allElements.length; i += WRAP_BY) {
        allElements.slice(i, i + WRAP_BY).wrapAll("<ul class=show" + y + "><li>");
        y++;
    }
    jQuery('#logo_slider .center_logo_slider_menu_part ul:first').addClass('referenzactive');
}
function elementscount() {
    ulelements = jQuery("#logo_slider .center_logo_slider_menu_part ul").length;

}
function rotate() {
    var durationreferenz = 1500;
    if (ulelements != 1) {
        if (jQuery("#logo_slider .center_logo_slider_menu_part ul").last().hasClass('referenzactive')) {

            jQuery("#logo_slider .center_logo_slider_menu_part ul").last().removeClass('referenzactive');
            jQuery("#logo_slider .center_logo_slider_menu_part ul").last().fadeOut(durationreferenz);

            jQuery("#logo_slider .center_logo_slider_menu_part ul").first().addClass('referenzactive');
            jQuery("#logo_slider .center_logo_slider_menu_part ul").first().fadeIn(durationreferenz);
        }
        else {
            jQuery("#logo_slider .center_logo_slider_menu_part ul.referenzactive").fadeOut(durationreferenz);
            jQuery("#logo_slider .center_logo_slider_menu_part ul.referenzactive").next().fadeIn(durationreferenz);

            jQuery("#logo_slider .center_logo_slider_menu_part ul.referenzactive").next().addClass('referenzactive');
            jQuery("#logo_slider .center_logo_slider_menu_part ul.referenzactive").prev().removeClass('referenzactive');
        }
    }
}