var m1c, m1t;
var m2c, m2t;
var m3c, m3t;
var m4c, m4t;

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

/*function layer_hide (name) {
	if (document.layers)
	{
		if (document.display[name]) document.display[name].visibility = "hide";
	}
	else
	{
		if (document.getElementById(name) && document.getElementById(name).style) document.getElementById(name).style.display = "none";
	}
}
*/
function m1s(name) {
	if (m1c && m1c != name) layer_hide(m1c);
	m1c = name;
	layer_show(m1c);
	if (m1t) clearTimeout(m1t);
	m1t = 0;
}

function m1h(name) {
	m1t = setTimeout('layer_hide(\''+name+'\')', 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;
	layer_show(m3c);
	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);
}

function m4s(name) {
	m4c = name;
	layer_show(m4c);
	if (m1t) clearTimeout(m1t);
	if (m2t) clearTimeout(m2t);
	if (m3t) clearTimeout(m3t);
	if (m4t) clearTimeout(m4t);
	m1t = 0;
	m2t = 0;
	m3t = 0;
	m4t = 0;
}

function m4h(name) {
	m1t = setTimeout('layer_hide(\''+m1c+'\')', 500);
	m2t = setTimeout('layer_hide(\''+m2c+'\')', 500);
	m3t = setTimeout('layer_hide(\''+m3c+'\')', 500);
	m4t = setTimeout('layer_hide(\''+name+'\')', 500);
}