function showQuestion(id)
{
	var i=1;
	while ( i <= 9 )
	{
		var id_nome = "pergunta" + i;
		if (id_nome != id)
		{
			var id_question = document.getElementById(id_nome);
			id_question.style.display='none';
		}
		i = i + 1;
	}	
			
				
	var id_question = document.getElementById(id);
			
	if ( id_question.style.display=='none' )
	{
		id_question.style.display='block';
	}
	else
	{
		id_question.style.display='none';
	}
}