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 = 3000;
	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 { // we're at the last slide
			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;
		}
	}
	// Deprecated methods
	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();
	}
}