function phoneFilter(form, format) {

var input = form.value;

if(input.length > 0) { //do not perform if empty input

var numbers = ""; //store all the numbers here

//process to remove non-numbers and spaces
for(var i = 0; i < input.length; i++) {
var char = input.charAt(i);
if(!(isNaN(char) || char == " ")) numbers += char;
}

//remove country code, if any
//if(numbers.substring(0, 2) == "47") numbers = numbers.substring(2, numbers.length);

var output = ""; //assign numbers here

//assign numbers to chosen format
var n = 0, i = 0;
while(i < format.length && n < numbers.length) {
var char = format.charAt(i);
if(char == "#") {
output += numbers.charAt(n++)
} else {
output += char;
}
i++;
}

//give alert if length is less than 8.
if(numbers.length < 8) {
alert("The number must be of length 8");
form.select();

}

form.value = output; //output to form
}
}


// non-digit characters allowed in phone numbers
var phoneNumberDelimiters = "()- ";
var digits = "0123456789";
var blanks = " \t\n\r";
// characters allowed in US phone numbers
var validUSPhoneChars = digits + phoneNumberDelimiters;

// U.S. phone numbers have 10 digits, formatted as ### ### #### or (###)###-####
var digitsInUSPhoneNumber = 10;

function isUSPhoneNumber(s) {
	var temp = stripCharsNotInBag(s, digits);
	if (isBlank(temp))
		{
			return false;
		}
	return( (temp.length == digitsInUSPhoneNumber) && isValidString(temp, validUSPhoneChars) );
}

function isBlank(s)
{
	var i;

	// Is s empty?
	if (isEmpty(s))
	return true;

	// Search through string's chars one by one until we find first
	// non-blank char, then return false; if we don't, return true
	for (i=0; i<s.length; i++)
	{
		// Check that current character isn't blank
		var c = s.charAt(i);
		if (blanks.indexOf(c) == -1)
		return false;
	}
	// All characters are blank
	return true;
}


// Returns true if string s is empty
function isEmpty(s)
{
	return ((s == null) || (s.length == 0));
}


// Removes all characters which do NOT appear in string bag from string s
function stripCharsNotInBag (s, bag)
  {
  var i;
  var returnString = "";

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

function isValidString(s, ValidChars)
{

	//if isBlank(s) return false;
		
	for(var i=0; i<s.length; i++)
	{
		if( ValidChars.indexOf(s.substr(i,1)) == -1)
			return false;
	}
	return true;
}

function isInteger(s)
  {

  if (isBlank(s))
    return false;

  // skip leading + or -
  if ((s.charAt(0) == "-") || (s.charAt(0) == "+"))
    var i = 1;
  else
    var i = 0;

  // Search through string's chars one by one until we find a
  // non-numeric char, then return false; if we don't, return true
  for (i; i<s.length; i++)
    {

    // Check that current character is number
    var c = s.charAt(i);
    if (!isDigit(c))
      return false;
    }
  // All characters are numbers
  return true;
  }

// Removes all characters which appear in string bag from string s
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 blank
    var c = s.charAt(i);
    if (bag.indexOf(c) == -1)
      returnString += c;
    }
  return returnString;
  }


// Returns true if character c is a digit (0 .. 9)

function isDigit(c)
  {
  return ((c >= "0") && (c <= "9"));
  }



//*****************Email Starts Here**********************
function isEmail(emailStr) {
/* The following pattern is used to check if the entered e-mail address
   fits the user@domain format.  It also is used to separate the username
   from the domain. */
var emailPattern=/^(.+)@(.+)$/;
/* The following string represents the pattern for matching all special
   characters.  We don't want to allow special characters in the address. 
   These characters include ( ) < > @ , ; : \ " . [ ]    */
var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
/* The following string represents the range of characters allowed in a 
   username or domainname.  It really states which chars aren't allowed. */
var validChars="\[^\\s" + specialChars + "\]"
/* The following pattern applies if the "user" is a quoted string (in
   which case, there are no rules about which characters are allowed
   and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
   is a legal e-mail address. */
var quotedUser="(\"[^\"]*\")"
/* The following pattern applies for domains that are IP addresses,
   rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
   e-mail address. NOTE: The square brackets are required. */
var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
/* The following string represents an atom (basically a series of
   non-special characters.) */
var atom=validChars + '+'
/* The following string represents one word in the typical username.
   For example, in john.doe@somewhere.com, john and doe are words.
   Basically, a word is either an atom or quoted string. */
var word="(" + atom + "|" + quotedUser + ")"
// The following pattern describes the structure of the user
var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
/* The following pattern describes the structure of a normal symbolic
   domain, as opp sed to ipDomainPat, shown above. */
var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")
/* Finally, let's start trying to figure out if the supplied address is
   valid. */

/* Begin with the coarse pattern to simply break up user@domain into
   different pieces that are easy to analyze. */
   
var matchArray=emailStr.match(emailPattern);

// Check for the Email start with number.
//if ('0123456789'.indexOf(emailStr.charAt(0)) >= 0)
//{
//   return false;
//}
if ('!%&\\(\\)<>@,;:\\\\\\\"\\.\\[\\]'.indexOf(emailStr.charAt(0)) >= 0) 
{
   return false; 	
}

if (matchArray==null) {
  /* Too many/few @'s or something; basically, this address doesn't
     even fit the general mould of a valid e-mail address. */
	//alert("Email address seems incorrect (check @ and .'s)")
	return false
}
var user=matchArray[1]
var domain=matchArray[2]

// See if "user" is valid 
if (user.match(userPat)==null) {
    // user is not valid
    //alert("The username doesn't seem to be valid.")
    return false
}

/* if the e-mail address is at an IP address (as opposed to a symbolic
   host name) make sure the IP address is valid. */
var IPArray=domain.match(ipDomainPat)
if (IPArray!=null) {
    // this is an IP address
	  for (var i=1;i<=4;i++) {
	    if (IPArray[i]>255) {
	  //      alert("Destination IP address is invalid!")
		return false
	    }
    }
    return true
}

// Domain is symbolic name
var domainArray=domain.match(domainPat)
if (domainArray==null) {
	//alert("The domain name doesn't seem to be valid.")
    return false
}

/* domain name seems valid, but now make sure that it ends in a
   three-letter word (like com, edu, gov) or a two-letter word,
   representing country (uk, nl), and that there's a hostname preceding 
   the domain or country. */

/* Now we need to break up the domain to get a count of how many atoms
   it consists of. */
var atomPat=new RegExp(atom,"g")
var domArr=domain.match(atomPat)
var len=domArr.length
if (domArr[domArr.length-1].length<2 || 
    domArr[domArr.length-1].length>3) {
   // the address must end in a two letter or three letter word.
   //alert("The address must end in a three-letter domain, or two letter country.")
   return false
}

// Make sure there's a host name preceding the domain.
if (len<2) {
   //var errStr="This address is missing a hostname!"
   //alert(errStr)
   return false
}

// If we've gotten this far, everything's valid!
return true;
}
//*****************Email Ends Here**********************