function ChangeIcon(dir)
{
	var idx = parseInt(document.getElementById('_icon').getAttribute('idx'));
	if (isNaN(idx)) return;
	idx += dir;
	idx = idx < 1 ? 1 : idx;
	idx = idx > 16 ? 16 : idx;
	document.getElementById('_icon').src = '/icon/' + idx + '.gif';
	document.getElementById('_icon').setAttribute('idx', idx);
	document.getElementById('icon').value = idx;
}

function CheckComment(formObj)
{
	if (formObj.nickname.value.replace(/\s+/gi, '').length == 0) return alert("Please enter your name."), false;
	if (formObj.content.value.replace(/\s+/gi, '').length == 0) return alert("Please enter your message."), false;
	if (formObj.content.value.length > 800) return alert("Content must shorter than 800 words."), false;
	return true;
}