function mostrar_div(obj){
	var div = document.getElementById(obj);
	div.className = "mostrar";
}

function esconder_div(obj){
	var div = document.getElementById(obj);
	div.className = "esconder";
}

function acao(obj){
	var div = document.getElementById(obj);
	if(div.className == "mostrar"){
		esconder_div(obj);
	}else{
		mostrar_div(obj);
	}
}