function mostraEsconde(var_id){
	
	img_ae1 = "../imagens/flecha1.jpg";
	img_ae2 = "../imagens/flecha2.jpg";
	
	if (document.getElementById(var_id) != null){
		
		if (document.getElementById(var_id).style.display == "block"){
			document.getElementById(var_id).style.display = "none";
			if (document.getElementById(var_id+"_f") != null) document.getElementById(var_id+"_f").src = img_ae1;
			return;
		}
		
		if (document.getElementById(var_id).style.display == "none"){
			document.getElementById(var_id).style.display = "block";
			if (document.getElementById(var_id+"_f") != null) document.getElementById(var_id+"_f").src = img_ae2;
			return;
		}
		
	}
	
}