JQuery - Show/Hide dropdown menu on hover

hide_show_menu_jquery.js

// Reference JQuery from Google CDN
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.js" type="text/javascript"></script>

// Markup
<ul id="jsddm">
    <li><a href="#">JavaScript</a>
        <ul>
            <li><a href="#">Drop Down Menu</a></li>
            <li><a href="#">jQuery Plugin</a></li>
            <li><a href="#">Ajax Navigation</a></li>
        </ul>
    </li>
    <li><a href="#">Effect</a>
        <ul>
            <li><a href="#">Slide Effect</a></li>
            <li><a href="#">Fade Effect</a></li>
            <li><a href="#">Opacity Mode</a></li>
            <li><a href="#">Drop Shadow</a></li>
            <li><a href="#">Semitransparent</a></li>
        </ul>
    </li>
    <li><a href="#">Navigation</a></li>
    <li><a href="#">HTML/CSS</a></li>
    <li><a href="#">Help</a></li>
</ul>

// CSS
#jsddm
{	margin: 0;
	padding: 0}
	
	#jsddm li
	{	float: left;
		list-style: none;
		font: 12px Tahoma, Arial}

	#jsddm li a
	{	display: block;
		background: #20548E;
		padding: 5px 12px;
		text-decoration: none;
		border-right: 1px solid white;
		width: 70px;
		color: #EAFFED;
		white-space: nowrap}

	#jsddm li a:hover
	{	background: #1A4473}
		
		#jsddm li ul
		{	margin: 0;
			padding: 0;
			position: absolute;
			visibility: hidden;
			border-top: 1px solid white}
		
		#jsddm li ul li
		{	float: none;
			display: inline}
		
		#jsddm li ul li a
		{	width: auto;
			background: #9F1B1B}
		
		#jsddm li ul li a:hover
		{	background: #7F1616}

// JQuery
var timeout    = 500;
var closetimer = 0;
var ddmenuitem = 0;

function jsddm_open()
{  jsddm_canceltimer();
   jsddm_close();
   ddmenuitem = $(this).find('ul').css('visibility', 'visible');}

function jsddm_close()
{  if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');}

function jsddm_timer()
{  closetimer = window.setTimeout(jsddm_close, timeout);}

function jsddm_canceltimer()
{  if(closetimer)
   {  window.clearTimeout(closetimer);
      closetimer = null;}}

$(document).ready(function()
{  $('#jsddm > li').bind('mouseover', jsddm_open)
   $('#jsddm > li').bind('mouseout',  jsddm_timer)});

document.onclick = jsddm_close;