//Derived from simple drop down menu on http://javascript-array.com
<!-- hide from old browsers

var timeout = 500;
var closetimer = 0;
var menuitem =0;

//open hidden layer
function mopen(id)
{
	//cancel close timer
	mcancelclosetimer();
	//close old layer
	if(menuitem) menuitem.style.visibility = 'hidden';
	//get new layer and show it
	menuitem=document.getElementById(id);
	menuitem.style.visibility = 'visible';
}
//close visible layer
function mclose()
{
	if(menuitem) menuitem.style.visibility = 'hidden';
}
//close timer
function mclosetimer()
{
	closetimer = window.setTimeout(mclose,timeout);
}
//cancel close timer
function mcancelclosetimer()
{
	if(closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}
//close layer when click out of item
//document.onclick = mclose();
-->