function string(what,chars,counter) {

	var d=document;

	if (what.value.length > chars) {
		what.value=what.value.substr(0,chars);
		alert('Excediste el máximo de caracteres que son '+chars+' en el campo de comentario');
	}

	counting = (chars - what.value.length);
	c = document.getElementById(counter);
	c.innerHTML = counting;
}
//-->