function validateUSZIPCode(field) {
    var valid = "0123456789-";
    var hyphencount = 0;

    if (field.length!=5 && field.length!=10) {
       // alert("Please enter your 5 digit or 5 digit+4 zip code.");
        return false;
    }
    for (var i=0; i < field.length; i++) {
        temp = "" + field.substring(i, i+1);
        if (temp == "-") hyphencount++;
        if (valid.indexOf(temp) == "-1") {
           // alert("Invalid characters in your zip code.  Please try again.");
            return false;
        }
        if ((hyphencount > 1) || ((field.length==10) && ""+field.charAt(5)!="-")) {
            //alert("The hyphen character should be used with a properly formatted 5 digit+four zip code, like '12345-6789'.   Please try again.");
            return false;
        }
    }
    return true;
}


function validateCAPostalCode(field) {
    var re = /^\s*[a-ceghj-npr-tvxy]\d[a-z](\s)?\d[a-z]\d\s*$/i
    if (re.test(field)) {
        return true;
    }
    else{
        return false;
    }
}

function Validate_String(string, return_invalid_chars) {
  valid_chars = '1234567890-_.^~abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
  invalid_chars = '';
  if(string == null || string == '')
     return(true);

  //For every character on the string.   
  for(index = 0; index < string.length; index++) {
    char = string.substr(index, 1);                        
     
    //Is it a valid character?
    if(valid_chars.indexOf(char) == -1) {
      //If not, is it already on the list of invalid characters?
      if(invalid_chars.indexOf(char) == -1) {
        //If it's not, add it.
        if(invalid_chars == '')
          invalid_chars += char;
        else
          invalid_chars += ', ' + char;
      }
    }
  }
            
  //If the string does not contain invalid characters, the function will return true.
  //If it does, it will either return false or a list of the invalid characters used
  //in the string, depending on the value of the second parameter.
  if(return_invalid_chars == true && invalid_chars != '') {
    last_comma = invalid_chars.lastIndexOf(',');
    if(last_comma != -1)
      invalid_chars = invalid_chars.substr(0, $last_comma) + 
      ' and ' + invalid_chars.substr(last_comma + 1, invalid_chars.length);
    return(invalid_chars);
    }
  else
    return(invalid_chars == ''); 
}


function validateEmailAddress(email_address) {
  //Assumes that valid email addresses consist of user_name@domain.tld
  at = email_address.indexOf('@');
  dot = email_address.indexOf('.');

  if(at == -1 || 
    dot == -1 || 
    dot <= at + 1 ||
    dot == 0 || 
    dot == email_address.length - 1)
    return(false);
     
  user_name = email_address.substr(0, at);
  domain_name = email_address.substr(at + 1, email_address.length);                  

  if(Validate_String(user_name) === false || 
    Validate_String(domain_name) === false)
    return(false);                     

  return(true);
}

function validatePhoneNumber(phone) {
    var stripped = phone.replace(/[\(\)\.\-\ ]/g, '');
    if (isNaN(parseInt(stripped))) {
       return false;
    }

    if (!(stripped.length == 10)) {
        return false;
    }
    return true;
}