function show_drop_down(menu_name)
{
	if (menu_name.substr(menu_name.length - 11,11) != "-navigation")
	{
		menu_name = menu_name + "-navigation";
	}

	var total_drop_downs = document.getElementById("drop-downs").getElementsByTagName("ul").length;

	for (var i = 0;i < total_drop_downs;i++)
	{
		if (document.getElementById("drop-downs").getElementsByTagName("ul")[i].id == menu_name)
		{
			document.getElementById("drop-downs").getElementsByTagName("ul")[i].className = "visible";
		}
		else
		{
			document.getElementById("drop-downs").getElementsByTagName("ul")[i].className = "";
		}
	}

	document.getElementById(menu_name.replace("-navigation","")).className = "active";
}

function hide_drop_downs(active_navigation_item)
{
	var total_drop_downs = document.getElementById("drop-downs").getElementsByTagName("ul").length;

	for (var i = 0;i < total_drop_downs;i++)
	{
		document.getElementById("drop-downs").getElementsByTagName("ul")[i].className = "";
	}

	var total_drop_downs = document.getElementById("navigation").getElementsByTagName("li").length;

	for (var i = 0;i < total_drop_downs;i++)
	{
		if (document.getElementById("navigation").getElementsByTagName("li")[i].id == active_navigation_item)
		{
			document.getElementById("navigation").getElementsByTagName("li")[i].className = "active";
		}
		else
		{
			document.getElementById("navigation").getElementsByTagName("li")[i].className = "";
		}
	}
}