/**
 * DHTML phone number validation script. 
 * Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */

// Declaring required variables
var digits = "0123456789";
// non-digit characters which are allowed in phone numbers
var phoneNumberDelimiters = "()- ";
// characters which are allowed in international phone numbers
// (a leading + is OK)
var validWorldPhoneChars = phoneNumberDelimiters + "+";
// Minimum no of digits in an international phone no.
var minDigitsInIPhoneNumber = 10;

function isInteger(s)
{   var i;
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag)
{   var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function checkInternationalPhone(strPhone) {
  s=stripCharsInBag(strPhone,validWorldPhoneChars);
  return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}

function validatePhone(phoneNumber) {
  if ((phoneNumber == null) || (phoneNumber == "")) {
    alert("Please enter your phone number.");
    return false;
  }
  if (checkInternationalPhone(phoneNumber) == false) {
    alert("Please enter a valid phone number.");
    return false;
  }
  return true;
}

function validateZIP(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;
}