function smartcheck( item_id, checkbox_name)
{
	var t = document.getElementById(item_id);
	if ( document.forms[0][checkbox_name].checked)
	{
		t.style.visibility = 'visible';
		t.style.display = 'block';
	}
	else
	{
		t.style.visibility = 'hidden';
		t.style.display = 'none';
	}
}