var t1 = 0;
var t2 = 0;
var t3 = 0;
var layemp = document.getElementById('layemp');
	var layser = document.getElementById('layser');
	var laycon = document.getElementById('laycon');
	var  layempfons = document.getElementById('layempfons');
	var  layconfons = document.getElementById('layconfons');
	var  layserfons = document.getElementById('layserfons');
	var  laymenufons = document.getElementById('laymenufons');
	 
function showMenu(m) {

	if (t1){
		clearTimeout(t1);
	}
	if (t2){
		clearTimeout(t2);
	}
	if (t3){
		clearTimeout(t3);
	}

	laymenufons.style.visibility = 'visible';
	switch(m) {
		case 'layemp': {
			layemp.style.visibility = 'visible';
			layempfons.style.visibility = 'visible';
			layser.style.visibility = 'hidden';
			layserfons.style.visibility = 'hidden';
			laycon.style.visibility = 'hidden';
			layconfons.style.visibility = 'hidden';
			break;
		}
		case 'layser': {
			layemp.style.visibility = 'hidden';
			layempfons.style.visibility = 'hidden';
			layser.style.visibility = 'visible';
			layserfons.style.visibility = 'visible';
			laycon.style.visibility = 'hidden';
			layconfons.style.visibility = 'hidden';
			break;
		}
		case 'laycon': {
			layemp.style.visibility = 'hidden';
			layempfons.style.visibility = 'hidden';
			layser.style.visibility = 'hidden';
			layserfons.style.visibility = 'hidden';
			laycon.style.visibility = 'visible';
			layconfons.style.visibility = 'visible';
			break;
		}
	}
	return false;
}
function hideMenu(m) {

	t1 = setTimeout("laymenufons.style.visibility = 'hidden'", 10);
	switch(m) {
		case 'layemp': {
		t2 = setTimeout("layemp.style.visibility = 'hidden'", 10);
		t3 = setTimeout("layempfons.style.visibility = 'hidden'", 10);
		layser.style.visibility = 'visible';
			break;
		}
		case 'layser': {
			t2 = setTimeout("layser.style.visibility = 'hidden'", 10);
			t3 = setTimeout("layserfons.style.visibility = 'hidden'", 10);
			break;
		}
		case 'laycon': {
			t2 = setTimeout("laycon.style.visibility = 'hidden'", 10);
			t3 = setTimeout("layconfons.style.visibility = 'hidden'", 10);
			layser.style.visibility = 'visible';
			break;
		}
	}
	return false;
}