function CardShowAnswer(card_id)
{
	el = document.getElementById('card_' + card_id + '_h');
	el.style.display='block';
	el = document.getElementById('card_' + card_id + '_l');
	el.style.display='none';
}

function CardMark(card_id, mark)
{
	f = document.forms['card_form_' + card_id];
	f.c.value=card_id;
	f.mark.value=mark;
	f.submit();
}