old = 0;
function changeNavi()
{
	//alert(document.getElementById("navigation").index[document.getElementById("navigation").value].innerHtml);
	//window.location.href = document.getElementById("navigation").innerHtml+".html"
	var selected = document.getElementById("navigation").value;
	document.getElementById("menu_"+selected).style.display = "block";
	if (old>0)
	{
		document.getElementById("menu_"+old).style.display = "none";
	}
	old = selected;
}

function openCloseMenu()
{
	var navigation = document.getElementById('options');

	if(navigation.style.display=="none")
		navigation.style.display = 'block';
	else
		navigation.style.display = 'none';
}