function mostraMenu(menu) {
	if (menu != ''){
		menu = document.getElementById(menu);
		
		var lista = new Array("empresa", "tecno", "qualidade","galeria");
		
		for (i =0; i<= lista.length -1; i++) {
			document.getElementById(lista[i]).style.display = "none";
		}
		document.getElementById("menu").style.display = "block";
		menu.style.display = "block";
	} else {
		document.getElementById("menu").style.display = "block";
	}
}

function abreSub(menu) {
	menu = document.getElementById(menu);
	
	document.getElementById("menu").style.display = "block";
	menu.style.display = "block";
}

function fechaMenu() {
	document.getElementById("menu").style.display = "none";
}

function fechaSub(menu) {
	menu = document.getElementById(menu);
	menu.style.display = "none";
}