function menu(estado){
	if(estado=="on"){
		document.getElementById("topo").style.zIndex="0";
		document.getElementById("conteudo").style.zIndex="2";
	}else{
		document.getElementById("topo").style.zIndex="2";
		document.getElementById("conteudo").style.zIndex="0";
	}
}

function aumenta() { document.getElementById("topo").style.height="400px"; }
function diminui() { document.getElementById("topo").style.height="95px"; }