function show_submenu( the_submenu ) {

	if (active_sub != 'submenu1') {
		document.getElementById('submenu1').style.visibility='hidden';
	}
	if (active_sub != 'submenu2') {
		document.getElementById('submenu2').style.visibility='hidden';
	}
	//document.getElementById( 'submenu3' ).style.visibility='hidden';

	document.getElementById( the_submenu ).style.visibility='visible';
	document.getElementById('submenu_detect').style.visibility='visible';
	document.getElementById( 'submenu_detect' ).style.height = document.getElementById( the_submenu ).clientHeight + 100 + 'px';
	return;
}

function hide_submenus() {

	if (active_sub != 'submenu1') {
		document.getElementById('submenu1').style.visibility='hidden';
	}
	if (active_sub != 'submenu2') {
		document.getElementById('submenu2').style.visibility='hidden';
	}
//	document.getElementById('submenu3').style.visibility='hidden';
	document.getElementById('submenu_detect').style.visibility='hidden';
}