function showQuestion(questionId)
{
	var strTD = document.getElementsByTagName("TD");
	var strTDAtual;
	var i;
	
	// inibe todas as question
	hideAllQuestion();
	
	// show selected question
	for(i=0;i<strTD.length;i++)
	{
		if(strTD[i].id.indexOf("ucPerguntas_grdPergunta") > -1)
		{
			// pega somente o numero q corresponde ao Id da question
			strTDAtual = strTD[i].id.substr(strTD[i].id.lastIndexOf("_")+1,strTD[i].id.length);
			if(strTDAtual == questionId)
			{
				strTD[i].style.visibility = "visible";
				strTD[i].style.display = "block";
			}
		}
	}
}

function hideAllQuestion()
{
	var strTD = document.getElementsByTagName("TD");
	var i;

	for(i=0;i<strTD.length;i++)
	{
		if(strTD[i].id.indexOf("ucPerguntas_grdPergunta") > -1)
		{
			strTD[i].style.visibility = "hidden";
			strTD[i].style.display = "none";
		}
	}
}