var temp = "finalidade";
var temp2;

function showhide(nome, origem) {
	if(nome != temp){
		document.getElementById(temp).style.display = "none";
		document.getElementById("ico_"+temp).style.backgroundPosition = "top";
		if(temp2 != null){
			temp2.className = "";
		}
		else{
			document.getElementById("primeiro").className = "";
		}
		document.getElementById(nome).style.display = "block";
		document.getElementById("ico_"+nome).style.backgroundPosition = "bottom";
		origem.className = "selecionado";
		temp = nome;
		temp2 = origem;
	}else{
		var obj = document.getElementById(temp);
		if(obj.style.display == "none"){
			document.getElementById(temp).style.display = "block";
			document.getElementById("ico_"+temp).style.backgroundPosition = "bottom";
			origem.className = "selecionado";
		}
		else{
			document.getElementById(temp).style.display = "none";
			document.getElementById("ico_"+temp).style.backgroundPosition = "top";
			origem.className = "";
		}
	}
}