function slide(src,link,text,target,attr){
this.src = src;
this.link = link;
this.text = text;
this.target = target;
this.attr = attr;
if (document.images){
this.image = new Image();
}
this.loaded = false;
this.load = function(){
if (!document.images){ return; }
if (!this.loaded){
this.image.src = this.src;
this.loaded = true;
}
}
this.hotlink = function(){
var mywindow;
if (!this.link) return;
if (this.target){
if (this.attr){
mywindow = window.open(this.link, this.target, this.attr);
} else{
mywindow = window.open(this.link, this.target);
}
if (mywindow && mywindow.focus) mywindow.focus();
} else{
location.href = this.link;
}
}
}
function slideshow( slideshowname ){
this.name = slideshowname;
this.repeat = true;
this.prefetch = -1;
this.image;
this.textid;
this.textarea;
this.timeout = 6000;
this.slides = new Array();
this.current = 0;
this.timeoutid = 0;
this.add_slide = function(slide){
var i = this.slides.length;
if (this.prefetch == -1){
slide.load();
}
this.slides[i] = slide;
}
this.play = function(timeout){
this.pause();
if (timeout){
this.timeout = timeout;
}
if (typeof this.slides[ this.current ].timeout != 'undefined'){
timeout = this.slides[ this.current ].timeout;
} else{
timeout = this.timeout;
}
this.timeoutid = setTimeout( this.name + ".loop()", timeout);
}
this.pause = function(){
if (this.timeoutid != 0){
clearTimeout(this.timeoutid);
this.timeoutid = 0;
}
}
this.update = function(){
if (! this.valid_image()){ return; }
if (typeof this.pre_update_hook == 'function'){
this.pre_update_hook();
}
var slide = this.slides[ this.current ];
var dofilter = false;
if (this.image &&
typeof this.image.filters != 'undefined' &&
typeof this.image.filters[0] != 'undefined'){
dofilter = true;
}
slide.load();
if (dofilter){
if (slide.filter &&
this.image.style &&
this.image.style.filter){
this.image.style.filter = slide.filter;
}
this.image.filters[0].Apply();
}
this.image.src = slide.image.src;
if (dofilter){
this.image.filters[0].Play();
}
this.display_text();
if (typeof this.post_update_hook == 'function'){
this.post_update_hook();
}
if (this.prefetch > 0){
var next, prev, count;
next = this.current;
prev = this.current;
count = 0;
do{
if (++next >= this.slides.length) next = 0;
if (--prev < 0) prev = this.slides.length - 1;
this.slides[next].load();
this.slides[prev].load();
} while (++count < this.prefetch);
}
}
this.goto_slide = function(n){
if (n == -1){
n = this.slides.length - 1;
}
if (n < this.slides.length && n >= 0){
this.current = n;
}
this.update();
}
this.goto_random_slide = function(include_current){
var i;
if (this.slides.length > 1){
do{
i = Math.floor(Math.random()*this.slides.length);
} while (i == this.current);
this.goto_slide(i);
}
}
this.next = function(){
if (this.current < this.slides.length - 1){
this.current++;
} else if (this.repeat){
this.current = 0;
}
this.update();
}
this.previous = function(){
if (this.current > 0){
this.current--;
} else if (this.repeat){
this.current = this.slides.length - 1;
}
this.update();
}
this.shuffle = function(){
var i, i2, slides_copy, slides_randomized;
slides_copy = new Array();
for (i = 0; i < this.slides.length; i++){
slides_copy[i] = this.slides[i];
}
slides_randomized = new Array();
do{
i = Math.floor(Math.random()*slides_copy.length);
slides_randomized[ slides_randomized.length ] =
slides_copy[i];
for (i2 = i + 1; i2 < slides_copy.length; i2++){
slides_copy[i2 - 1] = slides_copy[i2];
}
slides_copy.length--;
} while (slides_copy.length);
this.slides = slides_randomized;
}
this.get_text = function(){
return(this.slides[ this.current ].text);
}
this.get_all_text = function(before_slide, after_slide){
all_text = "";
for (i=0; i < this.slides.length; i++){
slide = this.slides[i];
if (slide.text){
all_text += before_slide + slide.text + after_slide;
}
}
return(all_text);
}
this.display_text = function(text){
if (!text){
text = this.slides[ this.current ].text;
}
if (this.textarea && typeof this.textarea.value != 'undefined'){
this.textarea.value = text;
}
if (this.textid){
r = this.getElementById(this.textid);
if (!r){ return false; }
if (typeof r.innerHTML == 'undefined'){ return false; }
r.innerHTML = text;
}
}
this.hotlink = function(){
this.slides[ this.current ].hotlink();
}
this.save_position = function(cookiename){
if (!cookiename) {
cookiename = this.name + '_slideshow';
}
document.cookie = cookiename + '=' + this.current;
}
this.restore_position = function(cookiename){
if (!cookiename) {
cookiename = this.name + '_slideshow';
}
var search = cookiename + "=";
if (document.cookie.length > 0) {
offset = document.cookie.indexOf(search);     
if (offset != -1) {
offset += search.length;
end = document.cookie.indexOf(";", offset);
if (end == -1) end = document.cookie.length;
this.current = parseInt(unescape(document.cookie.substring(offset, end)));
}
}
}
this.noscript = function(){
$html = "\n";
for (i=0; i < this.slides.length; i++){
slide = this.slides[i];
$html += '<P>';
if (slide.link){
$html += '<a href="' + slide.link + '">';
}
$html += '<img src="' + slide.src + '" ALT="slideshow image">';
if (slide.link){
$html += "<\/a>";
}
if (slide.text){
$html += "<BR>\n" + slide.text;
}
$html += "<\/P>" + "\n\n";
}
$html = $html.replace(/\&/g, "&amp;" );
$html = $html.replace(/</g, "&lt;" );
$html = $html.replace(/>/g, "&gt;" );
return('<pre>' + $html + '</pre>');
}
this.loop = function(){
if (this.current < this.slides.length - 1){
next_slide = this.slides[this.current + 1];
if (next_slide.image.complete == null || next_slide.image.complete){
this.next();
}
} else{ 
this.next();
}
this.play( );
}
this.valid_image = function(){
if (!this.image)
{
return false;
}
else{
return true;
}
}
this.getElementById = function(element_id){
if (document.getElementById){
return document.getElementById(element_id);
}
else if (document.all){
return document.all[element_id];
}
else if (document.layers){
return document.layers[element_id];
} else{
return undefined;
}
}
this.set_image = function(imageobject){
if (!document.images)
return;
this.image = imageobject;
}
this.set_textarea = function(textareaobject){
this.textarea = textareaobject;
this.display_text();
}
this.set_textid = function(textidstr){
this.textid = textidstr;
this.display_text();
}
}
function Link1() {
window.open("http://geographyfieldwork.com","_parent","resizable=yes,scrollbars=yes,status=no,width=790,height=540,top=0,left=0");
}
function Link2() {
self.location.href="SlideShows.htm";
}