var old;
var memold;
var subold;
if(document.layers)
{
	window.captureEvents(Event.MOUSEDOWN);
	window.onmousedown=do_out;
} else
{
	document.onmouseup=do_out;
}
function show_layer(x)
{
	if(document.layers)
		document.layers[x].visibility="show";
	else
		document.all[x].style.visibility="visible";
}
		
function hide_layer(x)
{
	if(document.layers)
		document.layers[x].visibility="hide";
	else
		document.all[x].style.visibility="hidden";
}
function do_menu(x)
{
	if(!old)
		old=memold;
	if(old!=x)
	{
		show_layer(x);
		old=x;
	} else
		old="";
}
function do_check(x)
{
	if(old && old!=x)
	{
		hide_layer(old);
		show_layer(x);
		old=x;
	}
	do_submenu();
}
function do_out()
{
	if(old)
		hide_layer(old);
	memold=old; old="";
	do_submenu();
}
function do_submenu(x)
{
	if(subold)
	{
		hide_layer(subold);
		subold="";
	}
	if(x)
	{
		show_layer(x);
		subold=x;
	}
}