Проблема с меню

[HarPy]

Может тема уже была озвучена. Помогите плиз. Как сделать чтобы по клику в меню кнопки "Главная" изменялся текст в <div id="cont"><p>Content</p></div> ?

===========================================================index.html

<link type="text/css" rel="stylesheet" href="harpy.files/css/menu.css" />
<script type="text/javascript" src="harpy.files/js/menu.js"></script>
</head>

<div id="menu">
<span class="preload1"></span>
<span class="preload2"></span>

<ul id="nav">
	<li class="top"><a href="#nogo1" id="root" class="top_link"><span>Главная</span></a></li>
</ul>
</div>

<div id="cont">
<p>Content</p>
</div>

===========================================================menu.css

.preload1 {background: url(../images/three_0a.gif);}
.preload2 {background: url(../images/three_1a.gif);}

#nav {padding:0; margin:0; list-style:none; height:38px; background:#fff url(../images/three_0.gif) repeat-x; position:relative; z-index:500; left: 10px; top:20; width: 960; font-family:arial, verdana, sans-serif;}
#nav li.top {display:block; float:left;}
#nav li a.top_link {display:block; float:left; height:35px; line-height:33px; color:#ccc; text-decoration:none; font-size:11px; font-weight:bold; padding:0 0 0 12px; cursor:pointer;background: url(../images/three_0.gif);}
#nav li a.top_link span {float:left; display:block; padding:0 24px 0 12px; height:35px; background: url(../images/three_0.gif) right top no-repeat;}
#nav li a.top_link span.down {float:left; display:block; padding:0 24px 0 12px; height:35px; background: url(../images/three_0a.gif) no-repeat right top;}

#nav li:hover a.top_link {color:#fff; background: url(../images/three_1.gif) no-repeat;}
#nav li:hover a.top_link span {background:url(../images/three_1.gif) no-repeat right top;}
#nav li:hover a.top_link span.down {background:url(../images/three_1a.gif) no-repeat right top; padding-bottom:3px;}

#nav li:hover {position:relative; z-index:200;}

#nav li:hover ul.sub
{left:1px; top:38px; background: #50b5d0; padding:3px; border:1px solid #0b4d97; white-space:nowrap; width:90px; height:auto; z-index:300;}
#nav li:hover ul.sub li
{display:block; height:20px; position:relative; float:left; width:90px; font-weight:normal;}
#nav li:hover ul.sub li a
{display:block; font-size:11px; height:18px; width:88px; line-height:18px; text-indent:5px; color:#000; text-decoration:none;border:1px solid #50b5d0;}
#nav li ul.sub li a.fly
{background:#50b5d0 url(../images/arrow.gif) 80px 6px no-repeat;}
#nav li:hover ul.sub li a:hover 
{background:#3f96a9; color:#fff; border-color:#fff;}
#nav li:hover ul.sub li a.fly:hover
{background:#3f96a9 url(../images/arrow_over.gif) 80px 6px no-repeat; color:#fff;}

#nav li b {display:block; font-size:11px; height:18px; width:88px; line-height:18px; margin-bottom:3px; text-indent:6px; color:#ff6; border-bottom:1px solid #ff6; cursor:default;}

#nav li:hover li:hover ul,
#nav li:hover li:hover li:hover ul,
#nav li:hover li:hover li:hover li:hover ul,
#nav li:hover li:hover li:hover li:hover li:hover ul
{left:90px; top:-4px; background: #50b5d0; padding:3px; border:1px solid #0b4d97; white-space:nowrap; width:90px; z-index:400; height:auto;}

#nav ul, 
#nav li:hover ul ul,
#nav li:hover li:hover ul ul,
#nav li:hover li:hover li:hover ul ul,
#nav li:hover li:hover li:hover li:hover ul ul
{position:absolute; left:-9999px; top:-9999px; width:0; height:0; margin:0; padding:0; list-style:none;}

#nav li:hover li:hover a.fly,
#nav li:hover li:hover li:hover a.fly,
#nav li:hover li:hover li:hover li:hover a.fly,
#nav li:hover li:hover li:hover li:hover li:hover a.fly
{background:#3f96a9 url(../images/arrow_over.gif) 80px 6px no-repeat; color:#fff; border-color:#fff;} 

#nav li:hover li:hover li a.fly,
#nav li:hover li:hover li:hover li a.fly,
#nav li:hover li:hover li:hover li:hover li a.fly
{background:#50b5d0 url(../images/arrow.gif) 80px 6px no-repeat; color:#000; border-color:#50b5d0;} 

===========================================================menu.js

stuHover = function() {
	var cssRule;
	var newSelector;
	for (var i = 0; i < document.styleSheets.length; i++)
		for (var x = 0; x < document.styleSheets[i].rules.length ; x++)
			{
			cssRule = document.styleSheets[i].rules[x];
			if (cssRule.selectorText.indexOf("LI:hover") != -1)
			{
				 newSelector = cssRule.selectorText.replace(/LI:hover/gi, "LI.iehover");
				document.styleSheets[i].addRule(newSelector , cssRule.style.cssText);
			}
		}
	var getElm = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<getElm.length; i++) {
		getElm[i].onmouseover=function() {
			this.className+=" iehover";
		}
		getElm[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" iehover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", stuHover);

Edited December 4, 2012 by alexriz
Для кода используйте тег CODE

[Great Rash]

getElm[i].onсlick = function() {
  document.getElementById('cont').innerHTML = 'я новый ХТМЛ';
}