function layer_show (name) {
	if (document.layers) {
		if (document.layers[name])
			document.layers[name].visibility = "show";
	} else {
		if (document.all[name] && document.all[name].style)
			document.all[name].style.visibility = "visible";
	}
}

function layer_hide (name) {
	if (document.layers) {
		if (document.layers[name])
			document.layers[name].visibility = "hide";
	} else {
		if (document.all[name] && document.all[name].style)
			document.all[name].style.visibility = "hidden";
	}
}

var m1c, m1t;
var m2c, m2t;
var m3c, m3t;

function m1s(name) {
	layer_hide("Nd0");
	if ( m1c && m1c != name )
		layer_hide(m1c);
	m1c = name;
	layer_show(m1c);
	if ( m1t )
		clearTimeout(m1t);
	m1t = 0;
}

function m1h(name) {
	layer_hide(name);
	m1t = setTimeout('layer_show("Nd0")', 500);
}

function m2s(name) {
	if ( m2c && m2c != name )
		layer_hide(m2c);
	m2c = name;
	layer_show(m2c);
	if ( m1t )
		clearTimeout(m1t);
	if ( m2t )
		clearTimeout(m2t);
	m1t = 0;
	m2t = 0;
}

function m2h(name) {
	m1t = setTimeout('layer_hide(\''+m1c+'\')', 500);
	m2t = setTimeout('layer_hide(\''+name+'\')', 500);
}

function m3s(name) {
	m3c = name;
	if ( m1t )
		clearTimeout(m1t);
	if ( m2t )
		clearTimeout(m2t);
	if ( m3t )
		clearTimeout(m3t);
	m1t = 0;
	m2t = 0;
	m3t = 0;
}

function m3h(name) {
	m1t = setTimeout('layer_hide(\''+m1c+'\')', 500);
	m2t = setTimeout('layer_hide(\''+m2c+'\')', 500);
	m3t = setTimeout('layer_hide(\''+name+'\')', 500);
}