$(function(){

    $("ul#top-navigation li").hover(function(){
        
        $(this).addClass("hover");
        $('ul:first',this).css('visibility', 'visible');
        
    }, function(){
    
        $(this).removeClass("hover");
        $('ul:first',this).css('visibility', 'hidden');
    
    });
    
    // 3 level menu
    //$("ul.dropdown li ul li:has(ul)").find("a:first").append(" » ");
    
    // calL preloader
    jQuery.preLoadImages(
        "/images/navigation/upper_nav_parenting-over.gif",
        "/images/navigation/upper_nav_healthy-kids-over.gif",
        "/images/navigation/upper_nav_education-over.gif",
        "/images/navigation/upper_nav_crafts-activities-over.gif",
        "/images/navigation/upper_nav_food-over.gif",
        "/images/navigation/upper_nav_celebration-corner-over.gif",
        "/images/navigation/upper_nav_parents-connect-over.gif",
        "/images/navigation/upper_nav_special-offers-over.gif"
    );
});

// preload hover images
var cache = [];

// arguments are image paths relative to the current page.
$.preLoadImages = function() {
    var args_len = arguments.length;
    for (var i = args_len; i--;) {
        var cacheImage = document.createElement('img');
        cacheImage.src = arguments[i];
        cache.push(cacheImage);
    }
}