document.write('<style type="text\/css">');
document.write('div.navDropdown { display: none; }');
document.write('<\/style>');

/* just turns item on/off when clicked */
function toggleVisibility(item)
{
	var elmnt = document.getElementById("item_" + item);
	if (elmnt.style.display == "block")
		elmnt.style.display = "none";
	else
		elmnt.style.display = "block";
}

/* turns item on and closes others */
function toggleVisSwap(itemClicked)
{
	var elmnt = "";
	for (i=1; i<=numNavDivs; i++)
		if (i != itemClicked)
		{
			elmnt = document.getElementById("item_" + i);
			elmnt.style.display = "none";
		}
	var elmntClicked = document.getElementById("item_" + itemClicked);
	if (elmntClicked.style.display == "block")
		elmntClicked.style.display = "none";
	else
		elmntClicked.style.display = "block";
}