function switchTab(obj, active, inactive) {
	var tabMenu = document.getElementById('tabmenu');
	var aList = tabMenu.getElementsByTagName('a');
	for ( var i = 0; i < aList.length; i++) {

		if (aList[i].title == 'tab') {
			aList[i].className = "";
		}
	}

	for ( var i = 0; i < inactive.length; i++) {
		document.getElementById(inactive[i]).className = "inactiveContent";
	}

	obj.className = "active";
	document.getElementById(active).className = "activeContent";
	return false;
}

/*
<ul id="tabmenu">
<li><a href="#" class="active" onclick="switchTab(this, 'content1', ['content2', 'content3'])" title="tab">Tab 1</a></li>
<li><a href="#" onclick="switchTab(this, 'content2', ['content1', 'content3'])" title="tab">Tab 2</a></li>
<li><a href="#" onclick="switchTab(this, 'content3', ['content1', 'content2'])" title="tab">Tab 3</a></li>
</ul>

<div id="content1" class="activeContent">
Content 1
</div>

<div id="content2" class="inactiveContent">
Content 2
</div>

<div id="content3" class="inactiveContent">
Content 3
</div>
*/