// Check for session cookies being enabled
function CheckSessionCookie () {

  if (testSessionCookie()) {
    return true;
  }
  else {
	location.href='cookies.aspx';
    return false;
  }
}  

function testSessionCookie () {
  document.cookie ="testSessionCookie=Enabled";
  if (getCookieValue ("testSessionCookie")=="Enabled")
    return true 
  else
    return false;
}


function getCookieValue (cookieName) {
  var exp = new RegExp (escape(cookieName) + "=([^;]+)");
  if (exp.test (document.cookie + ";")) {
    exp.exec (document.cookie + ";");
    return unescape(RegExp.$1);
  }
  else return false;
}



// Gallery rollovers
function SwitchPhoto(src,caption)
	{
	document.getElementById("gallery_closeup").style.display='block';
	document.getElementById("gallery_main_image").src=src;
	document.getElementById("gallery_main_caption").innerHTML=caption;
	}





// Search engine friendly link logger
function clickthru(target)
	{
	$.get("refer.aspx", { referurl: encodeURIComponent(target)} );
	return true;
	}




function AjaxRequest()
{
  var req;
  var method = "GET";
  var nocache = false;

  this.loadXMLDoc = function(url, params)
  {
    if(window.XMLHttpRequest) {
      try {
        req = new XMLHttpRequest();
      } catch(e) {
        req = false;
      }
    } else if(window.ActiveXObject) {
      try {
        req = new ActiveXObject("Msxml2.XMLHTTP");
      } catch(e) {
        try {
          req = new ActiveXObject("Microsoft.XMLHTTP");
        } catch(e) {
          req = false;
        }
      }
    }
    if(req) {
     req.onreadystatechange = processReqChange;
      if(nocache) {
        params += (params != '') ? '&' + (new Date()).getTime() : (new Date()).getTime();
      }
      if(method == "POST") {
        req.open("POST", url, true);
        req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
        req.send(params);
      } else {
        req.open(method, url + '?' + params, true);
        req.send(null);
      }
      return true;
    }
    return false;
  }
}  





// //////////////////////////////////////////////////////////////////////////////

// Checkout validation

// //////////////////////////////////////////////////////////////////////////////



function ValidateCheckoutStart(f)
	{


	if  (f.email.value=="")
			{
			alert('Please enter your email address');
			f.email.focus();
			return false;
			}

	else if (ValidateEmail(f.email.value) == false)
			{
			alert("Please enter a valid email address")
			f.email.focus();
			return false;
			}

	else if ( f.password.value=="" )
			{
			alert('Please enter your password');
			f.password.focus();
			return false;
			}


		else
			return true;
		
	}


function ValidateCheckoutAccount(f)
	{

	if ( (f.firstname.value=="") || (f.lastname.value=="") )
			{
			alert('Please enter your first name and last name');
			return false;
			}



	else if ( f.password.value=="" )
			{
			alert('Please enter a password for your account');
			return false;
			}




		else
			return true;
		
	}


function ValidateCheckoutAddress(f)
	{

	if ( (f.addressline1.value=="") || (f.city.value=="") || (f.postcode.value=="")  )
			{
			alert('Please make sure you have entered a valid address');
			return false;
			}

		else
			return true;
	
	}


function ValidateCheckout (f)
    {
	if (f.invoicepaymentmethod.value == 0)
			{
			alert('Please select the payment method');
			return false;
			}
		else if (f.cardnumber.value == "") 
			{
			alert('Please enter your credit or debit card number');
			return false;
			}
		else if ( (f.cardnumber.value.length != 15) && (f.cardnumber.value.length != 16) && (f.cardnumber.value.length != 18) )
			{
			alert('Please make sure you enter all the digits of your credit or debit card number');
			return false;
			}
		else if   (f.cardholdername.value == "") 
			{
			alert('Please enter the card holder name');
			return false;
			}
		else if  ((f.cardsecuritynumber.value.length < 3)  || (f.cardsecuritynumber.value.length > 4 ))
			{
			alert('Please enter the security number\nFor most cards this is the last 3 digits on the BACK of the card at the top of the signature strip\nFor American Express it is the 4 digits printed on the FRONT of the card above the account number');
			return false;
			}
/*
		else if  (f.cardexpiry.value == "")
			{
			alert('Please enter the card expiry date');
			return false;
			}
*/
			
	else
		return true;

}





/*
function validate_card (f)

{

if	(f.invoicepaymentmethod.value == 1 ) 
	{


		if (f.cardnumber.value == "") 
				{
				alert('Please enter the card number');
			return false;
				}

			else if   (f.cardholdername.value == "") 
				{
				alert('Please enter the card holder name');
			return false;
				}

			else if  (f.cardexpiry.value == "")
				{
				alert('Please enter the card expiry date');
			return false;
				}
        else
            return true; 
		}
	
else
    return true;
}

*/


function ValidateEmail(emailStr) {



/* 

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


The following variable tells the rest of the function whether or not
to verify that the address ends in a two-letter country or well-known
TLD.  1 means check it, 0 means don't. */

var checkTLD=1;

/* The following is the list of known TLDs that an e-mail address must end with. */

var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;

/* 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];

// Start by checking that only basic ASCII characters are in the strings (0-127).

for (i=0; i<user.length; i++) {
if (user.charCodeAt(i)>127) {
// alert("Ths username contains invalid characters.");
return false;
   }
}
for (i=0; i<domain.length; i++) {
if (domain.charCodeAt(i)>127) {
// alert("Ths domain name contains invalid characters.");
return false;
   }
}

// 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.  Check if it's valid.
 
var atomPat=new RegExp("^" + atom + "$");
var domArr=domain.split(".");
var len=domArr.length;
for (i=0;i<len;i++) {
if (domArr[i].search(atomPat)==-1) {
// alert("The domain name does not seem to be valid.");
return false;
   }
}

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

if (checkTLD && domArr[domArr.length-1].length!=2 && 
domArr[domArr.length-1].search(knownDomsPat)==-1) {
// alert("The address must end in a well-known domain or two letter " + "country.");
return false;
}

// Make sure there's a host name preceding the domain.

if (len<2) {
// alert("This address is missing a hostname!");
return false;
}

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