function Selecao(campo, indice)
{
	if(indice != 0)
	{
		switch(campo)
		{
			case 1: form.br.disabled = false;
					break;
			case 2: form.cat.disabled = false;
					break;			
			case 3: form.vr.disabled = false;
					break;
		}
	}
	else
	{
		switch(campo)
		{
			case 1: form.br.disabled = true;
					form.br.selectedIndex = 0;
					form.cat.disabled = true;
					form.cat.selectedIndex = 0;
					form.vr.disabled = true;
					form.vr.selectedIndex = 0;
					break;
			case 2: form.cat.disabled = true;
					form.cat.selectedIndex = 0;
					form.vr.disabled = true;
					form.vr.selectedIndex = 0;
					break;
			case 3: form.vr.disabled = true;
					form.vr.selectedIndex = 0;
					break;
		}
	}
	
}