<ul id="nav">

    <li><a href="#">Menu element 1</a>

        <ul>

            <li><a href="#">Submenu element</a></li>

            .....

        </ul>

    </li>

    <li><a href="#">Menu 4</a></li>

    .....

</ul>

#nav,#nav ul {

    list-style: none outside none;

    margin: 0;

    padding: 0;

}

#nav {

    font-family: "Lucida Sans Unicode",Verdana,Arial,sans-serif;

    font-size: 13px;

    height: 36px;

    list-style: none outside none;

    margin: 40px auto;

    text-shadow: 0 -1px 3px #202020;

    width: 700px;

    /* border radius */

    -moz-border-radius: 4px;

    -webkit-border-radius: 4px;

    border-radius: 4px;

    /* box shadow */

    -moz-box-shadow: 0px 3px 3px #cecece;

    -webkit-box-shadow: 0px 3px 3px #cecece;

    box-shadow: 0 3px 4px #8b8b8b;

    /* gradient */

    background-image: -webkit-gradient(linear, left bottom, left top, color-stop(0, #787878), color-stop(0.5, #5E5E5E), color-stop(0.51, #707070), color-stop(1, #838383));

    background-image: -moz-linear-gradient(center bottom, #787878 0%, #5E5E5E 50%, #707070 51%, #838383 100%);

    background-color: #5f5f5f;

}

#nav li {

    border-bottom: 1px solid #575757;

    border-left: 1px solid #929292;

    border-right: 1px solid #5d5d5d;

    border-top: 1px solid #797979;

    display: block;

    float: left;

    height: 34px;

    position: relative;

    width: 105px;

}

#nav > li:first-child {

    border-left: 0 none;

    margin-left: 5px;

}

#nav ul {

    left: -9999px;

    position: absolute;

    top: -9999px;

    z-index: 2;

}

#nav ul li {

    background: none repeat scroll 0 0 #838383;

    box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.5);

    width: 100%;

}

#nav li a {

    color: #FFFFFF;

    display: block;

    line-height: 34px;

    outline: medium none;

    text-align: center;

    text-decoration: none;

    /* gradient */

    background-image: -webkit-gradient(linear, left bottom, left top, color-stop(0, #787878), color-stop(0.5, #5E5E5E), color-stop(0.51, #707070), color-stop(1, #838383));

    background-image: -moz-linear-gradient(center bottom, #787878 0%, #5E5E5E 50%, #707070 51%, #838383 100%);

    background-color: #5f5f5f;

}

/* keyframes #animation */

@-webkit-keyframes animation {

    0% {

        -webkit-transform: scale(1);

    }

    30% {

        -webkit-transform: scale(1.2);

    }

    100% {

        -webkit-transform: scale(1.1);

    }

}

@-moz-keyframes animation {

    0% {

        -moz-transform: scale(1);

    }

    30% {

        -moz-transform: scale(1.2);

    }

    100% {

        -moz-transform: scale(1.1);

    }

}

#nav li > a:hover {

    /* CSS3 animation */

    -webkit-animation-name: animation;

    -webkit-animation-duration: 0.3s;

    -webkit-animation-timing-function: linear;

    -webkit-animation-iteration-count: 1;

    -webkit-animation-direction: normal;

    -webkit-animation-delay: 0;

    -webkit-animation-play-state: running;

    -webkit-animation-fill-mode: forwards;

    -moz-animation-name: animation;

    -moz-animation-duration: 0.3s;

    -moz-animation-timing-function: linear;

    -moz-animation-iteration-count: 1;

    -moz-animation-direction: normal;

    -moz-animation-delay: 0;

    -moz-animation-play-state: running;

    -moz-animation-fill-mode: forwards;

}

#nav li:hover ul {

    left: 0;

    top: 34px;

    width: 150px;

}

// variables

var aLoops = []; // sound loops

// initialization

addEvent(window, 'load', function (event) {

    // load music files

    aLoops[0] = new Audio('media/background.ogg');

    aLoops[0].volume = 0.3;

    aLoops[1] = new Audio('media/button.ogg');

    aLoops[1].volume = 1.0;

    aLoops[2] = new Audio('media/button_click.ogg');

    aLoops[2].volume = 1.0;

    aLoops[0].addEventListener('ended', function() { // loop background sound

        this.currentTime = 0;

        this.play();

    }, false);

    aLoops[0].play();

});

// all the buttons

var aBtns = document.querySelectorAll('#nav li');

// onmouseover event handler

addEvent(aBtns, 'mouseover', function (event) {

    aLoops[1].currentTime = 0;

    aLoops[1].play(); // play click sound

});

// onmouseout event handler

addEvent(aBtns, 'mouseout', function (event) {

    aLoops[1].currentTime = 0;

    aLoops[1].pause(); // play click sound

});

// onclick event handler

addEvent(aBtns, 'click', function (event) {

    aLoops[2].currentTime = 0;

    aLoops[2].play(); // play click sound

});