function doImages() {
	if (document.images) {
		picsoldout = new Image();
		picsoldout.src = "visual/gfx/stock_avail_soldout.jpg";

		piclow = new Image();
		piclow.src = "visual/gfx/stock_avail_low.jpg";

		picmedium = new Image();
		picmedium.src = "visual/gfx/stock_avail_medium.jpg";

		pichigh = new Image();
		pichigh.src = "visual/gfx/stock_avail_high.jpg";
	}
}

function changeImages(imgLoc, selectedOpt) {
	optId = selectedOpt.options[selectedOpt.selectedIndex].value;
	whichImg = document.forms["f_add_" + imgLoc].elements["f_" + optId].value;
	if (document.images) {
		thisImg = eval("pic" + whichImg + ".src");
		document["i_" + imgLoc].src = thisImg;
	}
}	

function closeWin() {
	this.window.close();
}

function confirmSubmit() {

	var fullname 			= document.forms['userform'].name;
	var address 			= document.forms['userform'].address;
	var postalcode 		= document.forms['userform'].postalcode;
	var city 					= document.forms['userform'].city;

	var email 				= document.forms['userform'].email;
	var emailRepeated = document.forms['userform'].email2;

	var telephone 		= document.forms['userform'].telephone;	

	if (fullname.value == "") {
		fullname.focus();
		alert("Please fill in your name.");		
		return false;		
	}
	
	if (address.value == "") {
		alert("Please fill in your address.");		
		address.focus();
		return false;		
	}	

	if (!validatePostalCode(postalcode.value)) {
		postalcode.focus();
		alert("Please fill in your postal code.");		
		return false;		
	}	
	
	if (city.value == "") {
		alert("Please fill in your city.");		
		city.focus();
		return false;		
	}	
		

	if (! emailCheck(email.value)) {
		email.focus();
		return false;		
	}
	
	if (email.value != emailRepeated.value) {
		emailRepeated.focus();
		alert("The two email addresses must be identical.");		
		return false;
	}

	if (!document.forms.userform.toa.checked)
  {
		alert("In order to fulfill your order, you'll have to agree with the terms of agreement.");
		return false ;
	}
	
	return true;
}

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!")
		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;
}

function validatePostalCode(strPC) {
  return typeof strPC=='string'
    ?strPC.match(/[1-9][0-9]{3} ?[a-zA-Z]{2}/)==strPC
    :false;
  //Met optimalisaties van Henk KH
}