$(document).ready(function() {
    $("#navigation_links li").mouseover(NavigationMouseOver);
    $("#navigation_links li").mouseout(NavigationMouseOut);
});

function NavigationMouseOver() {
    ClearOutClassesExcluding($(this).id);
    if ($(this).attr("id") != "end") {
        $(this).addClass("selectedNavigation");
        $(this).next().addClass("selectedNavigationNext");
    }
}

function NavigationMouseOut() {
    ClearOutClasses();
}

function ClearOutClasses() {
    $("#navigation_links li").each(ClearOutClass);
}

function ClearOutClassesExcluding(listItemId) {
    $("#navigation_links li:not('#" + listItemId + "')").each(ClearOutClass);
}

function ClearOutClass() {
    $(this).removeClass("selectedNavigation");
    $(this).next().removeClass("selectedNavigationNext");
}