var _br_imgix = 0;
var _br_speed = 7000;
var _br_timer;
var _br_imgsLength;

$(function () {
    _br_imgsLength = $("#roll_box ul.roll_images li").length;

    $("#roll_box ul.roll_images li a").each(function (ix, elm) {
        $(elm).hover(
            function () { clearInterval(_br_timer); },
            function () { clearInterval(_br_timer); _br_timer = setInterval(roteBanner, _br_speed); }
        );
    });

    _br_timer = setInterval(roteBanner, _br_speed);
});

function roteBanner() {
    _br_imgix++;
    if (_br_imgix >= _br_imgsLength) {
        _br_imgix = 0;
    }

    roteBannerSetImage();
}

function roteBannerSetImage() {
    var $now = $("#roll_box ul.roll_images li").not(":eq(" + _br_imgix + ")");
    $now.css("zIndex", 1);
    var $next = $("#roll_box ul.roll_images li").eq(_br_imgix);
    $next.css("zIndex", 2);
    $next.fadeIn(1500, function () {
        $now.hide();
    });
}