function changeNav(navMenu) {
    /*
    for (var i = 1; i <= 4; i++) {
        if (i != navMenu) {
            if ($('nav-menu' + i).visible()) {
                $('nav-menu' + navMenu).hide();
                $('nav-menu' + i).fade({
                    duration: 1.1
                });
            }
            //$('nav' + i).style.backgroundImage = "url('/images/nav_" + i + ".png')";
        }
    }
    */

   $('nav-menu1').hide();
   $('nav-menu2').hide();
   $('nav-menu3').hide();
   $('nav-menu4').hide();
    
    //$('nav' + navMenu).style.backgroundImage = "url('/images/nav_" + navMenu + "_hover.png')";
    /*
     *$('nav-menu' + navMenu).appear({
        duration: 1.2
    });
    */

    $('nav-menu' + navMenu).show();
}

/*
function disableNavs(){
    for (var i = 1; i <= 4; i++) {
        if ($('nav-menu' + i) && $('nav-menu' + i).visible()) {
            $('nav-menu' + i).fade({
                duration: 0.1
            });
            
            $('nav' + i).style.backgroundImage = "url('/images/nav_" + i + ".png')";
        }
    }
}
*/