function textcount(elm, helper, limit)
{
	elm = document.getElementById(elm);
	helper = document.getElementById(helper);

	text = elm.value;

	text = text.replace(/\r\n/g, "\n");

	var over = text.length > limit;

	var color = over ? 'style="color: Red;"' : 'style="color: Black;"';

	helper.innerHTML = 'あと<span ' + color + '>' + (limit - text.length) + '</span>文字です';
}