function funcaoAlternaDisplay(op)
{

	if (op == 1) 
	{
		document.getElementById('bgtotal').style.display="none";
		document.getElementById('contcase01').style.display="none";
		document.getElementById('contcase02').style.display="none";
		document.getElementById('contcase03').style.display="none";
	}
	else if (op == 2) 
	{
		document.getElementById('bgtotal').style.display="block";
		document.getElementById('contcase01').style.display="block";
	}
	else if (op == 3)
	{
		document.getElementById('bgtotal').style.display="block";
		document.getElementById('contcase02').style.display="block";
	}
	else if (op == 4)
	{
		document.getElementById('bgtotal').style.display="block";
		document.getElementById('contcase03').style.display="block";
	}
}