var curr_id = 0;

function rrr(obj)
{
	if ((z = obj.selectedIndex) == 0)
	{
		hide('sub_' + curr_id);
		return false;
	}

	id = obj.options[z].value;
	if (curr_id != 0 && curr_id != id)
		hide('sub_' + curr_id);

	show('sub_' + id);
	curr_id = id;
}

function get_el(el)
{
	return document.getElementById(el);
}

function show(el)
{
	obj = get_el(el);
	obj.style.display = "block";
	obj.style.visibility = "visible";
}

function hide(el)
{
	obj = get_el(el);
	obj.style.display="none";
	obj.style.visibility = "hidden";
}

function set_fields()
{
	for(i=3; i<=5; i++)
	{
		if (i <= document.add_form.answers.value)
		{
			show('answer_block_'+i);
		}
		else
		{
			hide('answer_block_'+i);
		}
	}
}