$(document).ready(function () {
    $('#ctl00_SideBar_pnlSideBarSession1').css({ opacity: 1.0 });
    $('#ctl00_SideBar_pnlSideBarSession2').css({ opacity: 0.8 });
    $('#ctl00_SideBar_pnlSideBarSession3').css({ opacity: 0.6 });

    $('.SideBarSession').hover(
        function () {
            $('#ctl00_SideBar_pnlSideBarSession1').animate({ opacity: 0.5 }, { queue: false, duration: 500 });
            $('#ctl00_SideBar_pnlSideBarSession2').animate({ opacity: 0.5 }, { queue: false, duration: 500 });
            $('#ctl00_SideBar_pnlSideBarSession3').animate({ opacity: 0.5 }, { queue: false, duration: 500 });

            $(this).animate({ opacity: 1.0 }, { queue: false, duration: 500 });
        }, function () {
            $('#ctl00_SideBar_pnlSideBarSession1').animate({ opacity: 1.0 }, { queue: false, duration: 500 });
            $('#ctl00_SideBar_pnlSideBarSession2').animate({ opacity: 0.8 }, { queue: false, duration: 500 });
            $('#ctl00_SideBar_pnlSideBarSession3').animate({ opacity: 0.6 }, { queue: false, duration: 500 });
        }
    );
});