// JavaScript Document


function is_valid_numeric(key)
{
	var VALID_NUMERIC_KEYS    = new Array(48, 49, 50, 51, 52, 53, 54, 55, 56, 57);
	var VALID_NAVIGATION_KEYS = new Array(8, 9, 13, 27, 46);
	var tecla = window.event.keyCode;
		  
    for (i = 0; i < VALID_NUMERIC_KEYS.length; i++){
		if (VALID_NUMERIC_KEYS[i] > tecla){
			
		  return false;
		}else{
			
		  if (VALID_NUMERIC_KEYS[i] == tecla)
			return true;
		}
	}
  return false;
}

function is_valid_navigation(key)
{

var VALID_NUMERIC_KEYS    = new Array(48, 49, 50, 51, 52, 53, 54, 55, 56, 57);
var VALID_NAVIGATION_KEYS = new Array(8, 9, 13, 27, 46);

  for (i = 0; i < VALID_NAVIGATION_KEYS.length; i++)
    if (VALID_NAVIGATION_KEYS[i] > key)
      return false;
    else
      if (VALID_NAVIGATION_KEYS[i] == key)
        return true;

  return false;
}