// Browser check function to write warnings into the web page when placed within a <script type="text/javascript"> tag

browser = navigator.appName;
version = navigator.appVersion;
function browser_caution() {

if (version.substring(0,1)<4) {
document.write('<font size="+1" color="#FF0000"><b>Caution:<\/b> You are running ' + browser + ' version ' + version.substring(0,3) +
' and many browsers lower than Version 4 do not support the JavaScript which provides the Popup images when you click on the thumbnails on this page.</font><p>') 
}
if ( (navigator.userAgent.indexOf("MSIE") != -1) && (navigator.userAgent.indexOf("Mac") != -1) ) {document.write('<font size="+1" color="#FF0000"><b>Caution: Apple Users<\/b> - Please do not close Popup Windows containing the larger images you get by clicking on icons, they will be closed automatically when you leave this page. If you close them you may need to refresh the page.<\/font><p>')
}
}

// Routine for popup windows with title, size and background colour parameter (5 parameters)

var newwindow;
var wheight = 0, wwidth = 0;

function popitup5(url, title, iwidth, iheight, colour) {
var pwidth, pheight;
if ( navigator.userAgent.indexOf("Firefox") != -1)  {tidy()}; // Close window if not IE

if ( !newwindow || newwindow.closed ) {
	pwidth=iwidth+30;
	pheight=iheight+30;
	newwindow=window.open('','htmlname','width=' + pwidth +',height=' +pheight + ',resizable=1,top=50,left=10,status=1 ');
	wheight=iheight;
	wwidth=iwidth;
}
 
if (wheight!=iheight || wwidth!=iwidth ) {
	pwidth=iwidth+30;
	pheight=iheight+90;
	if (version.substring(0,1)>3) { 	// check browser v4+ supporting JavaScript 1.2	
		newwindow.resizeTo(pwidth, pheight);
	}
	wheight=iheight;
	wwidth=iwidth;
}

newwindow.document.clear();
newwindow.focus();
newwindow.document.writeln('<html> <head> <title>' + title + ' <\/title> <\/head> <body bgcolor= \"' + colour + '\"> <center>');
newwindow.document.writeln('<img src=' + url + '  title=\"' + title + '\"   alt=\"' + title + '\" >');
newwindow.document.writeln('<\/center> <\/body> <\/html>');
newwindow.focus()
newwindow.document.close();
newwindow.focus();
}

//Routines used specifically for popup feedback form windows

var fbwindow
function fbpopitup(url) {
if ( navigator.userAgent.indexOf("Firefox") != -1)  {tidy()}; // Close window if not IE
if (fbwindow && !fbwindow.closed) 
	{ fbwindow.location.href = url; fbwindow.focus(); } 
else 
	{ fbwindow=window.open(url,'fhtmlname','width=520,height=420,resizable=1,scrollbars=1,top=50,left=10'); }
}

//Routines to tidy up popup windows when page is left

function tidy() {tidy5() }
function tidy5() {
tidyh();
fbtidy();
}

function tidyh() {
if (newwindow && !newwindow.closed) { newwindow.close(); }
}

function fbtidy(){
if (fbwindow && !fbwindow.closed) {fbwindow.close(); } }	

//routines to simulate functions used on older pages. 

function popitup(url) { popitup5(url , 'Digital Image 384x288', 384, 288, 'white') }
function ppopitup(url) { popitup5(url , 'Photographic Image 400x267',400, 267, 'white') }

function vpopitup(url) { popitup5(url , 'Digital Image 288x384', 288,384, 'white') }
function pvpopitup(url) { popitup5(url , 'Photographic Image 267x400', 267, 400, 'white') }


//Routines for cookies used to remember if user has broadband

/* Call function as setCookie("cookiename" , cookievalue, lifetime, cookiepath)
with the lifetime required in days, -1 to delete a cookie or zero
for a temporary cookie. The Cookie Path is optional.*/

function setCookie(cookie_name, cookie_value, cookie_life, cookie_path) {
  var today = new Date()
  var expiry = new Date(today.getTime() + cookie_life * 24*60*60*1000)
  if (cookie_value != null && cookie_value != ""){
    var cookie_string =cookie_name + "=" + escape(cookie_value)
    if(cookie_life){ cookie_string += "; expires=" + expiry.toGMTString()}
    if(cookie_path){ cookie_string += "; path=" + cookie_path}
	document.cookie = cookie_string
  }
} // Based on JavaScript provided by Peter Curtis at www.pcurtis.com -->

/* Call function as getCookie("cookiename") It returns the value of a cookie
if set or null. Beware of potential ambiguities in names of cookies -
getCookie is simple and will match the end of a string so xyname 
will also be matched by yname and ame. */
 
function getCookie(name) {
  var index = document.cookie.indexOf(name + "=")
  if (index == -1) { return null}
  index = document.cookie.indexOf("=", index) + 1
  var end_string = document.cookie.indexOf(";", index)
  if (end_string == -1) { end_string = document.cookie.length }
  return unescape(document.cookie.substring(index, end_string))
} // Based on JavaScript provided by Peter Curtis at www.pcurtis.com -->

// Function to toggle flag for broadband users

function toggle(){
		if (getCookie('broadband') != "true") {
			setCookie('broadband',"true",0,"/");
			}
		else  {
			setCookie('broadband',"false",0,"/");
			}
		}

// Functions called for vertical and horizontal popups of two different sizes (image files end in i.jpg for icon, w.jpg for small image (400*300) and b.jpg for large images (600x450)

	function popitup2v(url,title) {
		if ( getCookie('broadband') == "true") {url=url+'b.jpg';popitup5(url , title, 400, 600, 'white') }
		else {url=url+'w.jpg'; popitup5( url , title, 266, 400, 'white') }	}

	function popitup2h(url,title) { 
		if ( getCookie('broadband') == "true") {url=url+'b.jpg';popitup5(url , title, 600, 400, 'white') }
		else { url=url+'w.jpg'; popitup5( url, title, 400, 266, 'white')
 		}}

/*
Functions to put in the HTML to provide simplified calls for vertical and horizontal popups with a doubleClick event handler calling toggle() so that large popups can be displayed if user has broadband

<IMG src= "imagei.jpg" alt="title"  title="title"  width = "160" height = "120" border = "0" align="left" hspace = 10 vspace = 10 onDblClick="toggle()"  onClick="popitup2h('image' , 'title')" </IMG>

*/

	function hpop(image, title, alignment) {
		document.write('<IMG src= \"' +image + 'i.jpg\" alt=\"' + title + '\"  title=\"' + title + '\"    width = 160 height = 106 border = 0 align=\"' + alignment + '\" hspace = 10 vspace = 10 onDblClick=\"toggle()\"  onClick=\"popitup2h(\' '+ image+'\' ,\' ' + title+ '  \' )\" <\/IMG>') }

	function vpop(image, title, alignment) {
		document.write('<IMG src= \"' +image + 'i.jpg\" alt=\"' + title + '\"  title=\"' + title + '\"     width = 106 height = 160 border = 0 align=\"' + alignment + '\" hspace = 10 vspace = 10 onDblClick=\"toggle()\"  onClick=\"popitup2v(\''+ image+ '\' ,\' ' + title+ '  \' )\" <\/IMG>') }

<!-- ;

//Last Updated 3rd December 2006
