function countValueChars(field, count_field, limit) {
	field = $(field); // Using Prototype.js
	// Old way: 
	//field = document.getElementById(field);
	count_field = $(count_field);
	if (field.value.length > limit) field.value = field.value.substring(0, limit); 
	else count_field.value = limit - field.value.length; 
}
/*function isNum(field) {
	var field = $(field);
	if (window.event.keyCode < 46 || window.event.keyCode > 57) window.event.returnValue = false;
	else window.event.returnValue = true;
}*/