<!--//
  // 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);
  }
//-->