var b_q;
function show_question(q)
{
	if(b_q)
	{
		document.getElementById(b_q).style.display = 'none';
		document.getElementById(b_q+'link').style.fontWeight = 'normal';
	}
	if(b_q != q)
	{
		b_q = q;
		document.getElementById(b_q).style.display = 'block';
		document.getElementById(b_q+'link').style.fontWeight = 'bold';
	}
	else
	{
		b_q = '';
	}
	ajustar();
}