var old;
var memold;
var subold;

if(document.layers)
{
window.captureEvents(Event.MOUSEDOWN);
window.onmousedown=do_out;
} else
{
document.onmouseup=do_out;
}

function do_out()
{
if(old)
hide_layer(old);
memold=old; old="";
do_submenu();
}

function show_layer(x)
{

if (document.getElementById && document.getElementById(x) != null)

node = document.getElementById(x).style.visibility='visible';

else if(document.layers)
document.layers[x].visibility="show";

else
document.all[x].style.visibility="visible";

}

function hide_layer(x)
{

if (document.getElementById && document.getElementById(x) != null)

node = document.getElementById(x).style.visibility='hidden';

else if(document.layers)
document.layers[x].visibility="hide";
else
document.all[x].style.visibility="hidden";

}

function do_submenu(x)
{

if(subold)
{
hide_layer(subold);
subold="";
}

if(x)
{
show_layer(x);
subold=x;
}
}