$(document).ready(function() {
    $("#nav").children(":last").children("a").not(".light").mouseover(function() {
        $("#navigation").addClass("light");
        $("#navigation-right").addClass("navigation-right-light");
    });
    $("#nav").children(":last").children("a").not(".light").mouseout(function() {
        $("#navigation").removeClass("light");
        $("#navigation-right").removeClass("navigation-right-light");
    });
    $("#nav").children(":first").children("a").not(".light").mouseover(function() {
        $("#navigation-left").addClass("navigation-left-light");
    });
    $("#nav").children(":first").children("a").not(".light").mouseout(function() {
        $("#navigation-left").removeClass("navigation-left-light");
    });
    
    if ( $("#nav").children(":first").children("a").hasClass("light") ) {
        $("#navigation-left").addClass("navigation-left-light");
    }
    if ( $("#nav").children(":last").children("a").hasClass("light") ) {
        $("#navigation").addClass("light");
        $("#navigation-right").addClass("navigation-right-light");
    }
});