function updateCharsLeft(s) {
	var maxChars = 150;
	var charsLeft = (maxChars - s.length);
	if(charsLeft <= 0) {
		document.getElementById('giftMsgTxt').value = s.substr(0, maxChars);
		charsLeft = 0;
	}
	document.getElementById('charsLeft').innerHTML = charsLeft + ' chars left';
}