How to make my "nav" bar a dropdown?

/*Nav Bar Stuff*/
	
 .wrapper {
    width: 100%;
    height: 80px;
    background : #464646;
    background : -webkit-gradient(linear, left top, left bottom, from(rgb(168,168,168)), to(rgb(69,69,69)));
    background : -moz-linear-gradient(top, rgb(168,168,168), rgb(69,69,69));
    border-top: 2px solid #939393;
    margin-bottom: 10px;
	text-shadow: 0 1px 1px rgba(255,255,255,0.4);
}

 .fl {
    float: left;
}

 .container {
    width: 840px;
	margin: 0 auto;
}

 .menu {
    height: 80px;
    border-left: 1px solid rgba(0,0,0,0.3);
    border-right: 1px solid rgba(255,255,255,0.3);
    float:left;
}

 .nav {
    text-decoration: none;
    color: #363636;
    text-transform: uppercase;
    font-size: 15px;
    font-weight: bold;
}

#nav ul {
    margin: 0;
    padding: 0;
}

#nav ul.menu li {
    list-style: none;
    float:left;
    height: 79px;
    text-align: center;
    background: -webkit-gradient(radial, 50% 100%, 10, 50% 50%, 90, from(rgba(31,169,244,1)), to(rgba(0,28,78, 1)) );
    background: -moz-radial-gradient(center 80px 45deg, circle cover, rgba(31,169,244,1) 0%, rgba(0,28,78, 1) 100%);
    }

#nav ul li a {
    display: block;
    padding: 0 20px;
    border-left: 1px solid rgba(255,255,255,0.1);
    border-right: 1px solid rgba(0,0,0,0.1);
    text-align: center;
    line-height: 79px;
    background : -webkit-gradient(linear, left top, left bottom, from(rgb(168,168,168)), to(rgb(69,69,69)));
    background : -moz-linear-gradient(top, rgb(168,168,168), rgb(69,69,69));
    -webkit-transition-property: background;
    -webkit-transition-duration: 700ms;
    -moz-transition-property: background;
    -moz-transition-duration: 700ms;
    }

#nav ul li a:hover {
    background: transparent none;
}

#nav ul[rel=sam1] li a {
    background: #606060;
}

#nav ul[rel=sam1] li a:hover {
    background: transparent none;
}

#nav ul li.active a{
    background: -webkit-gradient(radial, 50% 100%, 10, 50% 50%, 90, from(rgba(31,169,244,1)), to(rgba(0,28,78, 1)) );
    background: -moz-radial-gradient(center 80px 45deg, circle cover, rgba(31,169,244,1) 0%, rgba(0,28,78, 1) 100%);
}