function changeQA(qid,aid)
{
	if(document.getElementById(aid).style.display == 'block')
	{
		document.getElementById(qid).className='list_expand';
		document.getElementById(aid).style.display = "none";
	}
	else
	{
		document.getElementById(qid).className='list';
		document.getElementById(aid).style.display = "block";
	}
}