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 if (document.all)
		document.all[x].style.visibility="visible";
	else 
		document.getElementById(x).style.visibility="visible";
}
function hide_layer(x)
{
	if(document.layers)
		document.layers[x].visibility="hide";
	else if (document.all)
		document.all[x].style.visibility="hidden";
	else 
		document.getElementById(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(document.layers)
		DoObject=document.layers[x];
	else if (document.all)
		DoObject=document.all[x];
	else 
		DoObject=document.getElementById(x);
	if(old && old!=x)
	{
		if(document.layers)
			DoOldObject=document.layers[old];
		else if (document.all)
			DoOldObject=document.all[old];
		else 
			DoOldObject=document.getElementById(old);
		if (DoOldObject)
		{
			hide_layer(old);
		}
			if (DoObject)
		{
			show_layer(x);
		}
		old=x;
	}
	if(DoObject) 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;
	}
}