// JavaScript Document<!-- 






// define whitespace characters
var whitespace = " \t\n\r";
/* Define validations to run */
validations = new Array();
	validations[0]=["document.myform.FirstName", "notblank"];
	validations[1]=["document.myform.Surname", "notblank"];
	validations[2]=["document.myform.email", "validemail"];
	
function isEmpty(s)
{
var i;
if((s == null) || (s.length == 0))
	return true;
	// Search string looking for characters that are not whitespace
		for(i = 0; i < s.length; i++)
		{
		var c = s.charAt(i);
		if (whitespace.indexOf(c) == -1)
			return false;
		}
		// All characters are whitespace.
		return true;
}

function isEmail(field)
{
	var positionOfAt;
	var s = field.value;
	var ename = "yahoo";
	if (isEmpty(s))
		{
		alert("Email field may not be empty");
		field.focus();
		return false;
		}
	positionOfAt = s.indexOf('@',1);
	if ( (positionOfAt == -1) || (positionOfAt == (s.length-1)) )
		{
		alert("Email is not in valid form! Please check that you have included the @ symbol.");
		field.focus();
		return false;
		}
return true;
}

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

function isInteger(field)
{
	var i, c;
	var s = field.value;
	if (isEmpty(s))
		{
			alert("This field cannot be empty, and must contain numbers.");
			field.focus();
			return false;
		}
	for (i = 0; i < s.length; i++)
		{  // Check if current character is number.
			c = s.charAt(i);
			if (!isDigit(c))
			{
				alert("This is a numeric field, and only numbers can be used.");
				field.focus();
				return false;
			}
		}
	return true;
}

function validate()
{
	var i;
	var checkToMake;
	var field;
	
	for (i = 0; i < validations.length; i++)
	{
		checkToMake = validations[i][1];
		field = eval(validations[i][0]);
		switch (checkToMake)
		{
			case 'notblank': if (isEmpty(field.value))
					{
					alert("This field may not be empty and must be filled in.");
					field.focus();
					return false;
					}
					break;
			case 'validemail': if (!emailCheck(field))
					return false;
					break;
			case 'isnumber': if (!isInteger(field))
					return false;
		}
	}
	return true;
}
//-->






<!-- Changes:  Sandeep V. Tamhankar (stamhankar@hotmail.com) -->

/* 1.1.2: Fixed a bug where trailing . in e-mail address was passing
            (the bug is actually in the weak regexp engine of the browser; I
            simplified the regexps to make it work).
   1.1.1: Removed restriction that countries must be preceded by a domain,
            so abc@host.uk is now legal.  However, there's still the 
            restriction that an address must end in a two or three letter
            word.
     1.1: Rewrote most of the function to conform more closely to RFC 822.
     1.0: Original  */

<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

<!-- Begin
function emailCheck (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 emailPat=/^(.+)@(.+)$/
/* 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 opposed 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(emailPat)
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!");
			field.focus();
		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. (i.e.  com.au)")
   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;
}
//  End -->