function setMaxLength() {
	var x = document.getElementsByTagName('textarea');
	for (var i=0;i<x.length;i++) {
		if (x[i].getAttribute('maxlength')) {
			x[i].onkeyup = x[i].onchange = checkMaxLength;
			x[i].onkeyup();
		}
	}
}

function checkMaxLength() {
	var maxLength = this.getAttribute('maxlength');
	var currentLength = this.value.length;
	if (currentLength > maxLength)
		this.value = this.value.substring(0,maxLength);
}