function show_categs(type)
{
	var cat1 = document.getElementById('cat1');
	var cat2 = document.getElementById('cat2');
	var cat3 = document.getElementById('cat3');

	if (type=='featured')
	{
	cat1.disabled = false;
    cat2.disabled = false;
	cat3.disabled = false;
	return false;
	}
	if (type=='normal')
	{
	cat1.disabled = true;
    cat2.disabled = true;
	cat3.disabled = true;
	return false;
	}
	if (type=='reciprocal')
	{
	cat1.disabled = true;
    cat2.disabled = true;
	cat3.disabled = true;
	return false;
	}
	if (type=='free')
	{
	cat1.disabled = true;
    cat2.disabled = true;
	cat3.disabled = true;
	return false;
	}
}