function Expand()
{
	var root=document.getElementById('c_nav');
	var all_lis=root.getElementsByTagName('li');
	for(var i=0; i<all_lis.length; i++)
	{
		if (all_lis[i].childNodes.length > 2)
		{
			all_lis[i].childNodes[0].onclick = function () 
			{
				var nested_uls = this.parentNode.getElementsByTagName('ul');
//				alert(nested_uls[0].className);
				nested_uls[0].className=(nested_uls[0].className == '' ) ? 'opened' : '';
			}

		}
	}
}