function changeUseful(cid, answer)
{
	sendHTTPRequest(usefulResponse, "ajax/update_series_comment.php?c=" + cid + "&a="+answer);
}

function usefulResponse(request)
{
	var resp = request.responseText;
	
	var colonPos = resp.indexOf(':');
	if (!colonPos || colonPos == -1)
	{
		return;
	}
	var cid = resp.substring(0,colonPos);

	var response = resp.substring(colonPos+1);

	var elem = document.getElementById('series_comment_' + cid);

	document.getElementById('series_comment_' + cid).innerHTML = "";

	if (response == 2)
	{
		elem.innerHTML = "<BR><BR><i>Did you find this comment useful?</i>&nbsp;<a href='javascript:changeUseful(" + cid + ", 1)'><u><i>Yes</i></u></a>&nbsp;&nbsp;<a href='javascript:changeUseful(" + cid + ", 0)'><u><i>No</i></u></a>";
	}
	else
	{
		var indicator = response.substring(0,1);
		var result = response.substring(1);

		elem.innerHTML = "";

		if (result == 1)
		{
			elem.innerHTML += "<br><br><i>You found this comment useful.</i>";
		}
		else
		{
			elem.innerHTML += "<br><br><i>You didn't find this comment useful.</i>";
		}

		if (indicator == 'u')
		{
			elem.innerHTML += "&nbsp;&nbsp;<a href='javascript:changeUseful(" + cid  + ", 2)'><u><i>Undo</i></u></a>";
		}
	}
}