// There are two objects defined in this file:
// "slide" - contains all the information for a single slide
// "slideshow" - consists of multiple slide objects and runs the slideshow

//==================================================
// slide object
//==================================================
function slide(src,link,text,alt,target,attr) 
{
	// This is the constructor function for the slide object.
	// It is called automatically when you create a new slide object.
	// For example:
	// s = new slide();

	// Image URL
	this.src = src;

	// Link URL
	this.link = link;

	// Text to display
	this.text = text;

	// Text for alt
	this.alt = alt;

	// Name of the target window ("_blank")
	this.target = target;

	// Custom duration for the slide, in milliseconds.
	// This is an optional parameter.
	// this.timeout = 3000

	// Attributes for the target window:
	// width=n,height=n,resizable=yes or no,scrollbars=yes or no,
	// toolbar=yes or no,location=yes or no,directories=yes or no,
	// status=yes or no,menubar=yes or no,copyhistory=yes or no
	// Example: "width=200,height=300"
	this.attr = attr;

	// Create an image object for the slide
	if (document.images) 
	{
		this.image = new Image();
	}

	// Flag to tell when load() has already been called
	this.loaded = false;

	//--------------------------------------------------
	this.load = function() 
	{
		// This method loads the image for the slide

		if (!document.images) { return; }

		if (!this.loaded) {
		this.image.src = this.src;
		this.image.alt = this.alt;
		this.image.title = this.alt;
		this.loaded = true;
		}
	}

	//--------------------------------------------------
	this.pagelink = function() 
	{
		// This method jumps to the slide's link.
		// If a window was specified for the slide, then it opens a new window.

		var mywindow;

		// If this slide does not have a link, do nothing
		if (!this.link) return;

		// Open the link in a separate window?
		if (this.target) {

		// If window attributes are specified,
		// use them to open the new window
		if (this.attr) {
			mywindow = window.open(this.link, this.target, this.attr);
		} else {
			// If window attributes are not specified, do not use them
			// (this will copy the attributes from the originating window)
			mywindow = window.open(this.link, this.target);
		}

		// Pop the window to the front
		if (mywindow && mywindow.focus) 
			mywindow.focus();
		} else {
			// Open the link in the current window
			location.href = this.link;
		}
	}
}

//==================================================
// slideshow object
//==================================================
function slideshow( slideshowname ) 
{
	// This is the constructor function for the slideshow object.
	// It is called automatically when you create a new object.
	// For example:
	// ss = new slideshow("ss");

	// Name of this object
	// (required if you want your slideshow to auto-play)
	// For example, "SLIDES1"
	this.name = slideshowname;

	// When we reach the last slide, should we loop around to start the
	// slideshow again?
	this.repeat = true;

	// Number of images to pre-fetch.
	// -1 = preload all images.
	//  0 = load each image is it is used.
	//  n = pre-fetch n images ahead of the current image.
	// I recommend preloading all images unless you have large
	// images, or a large amount of images.
	this.prefetch = -1;

	// IMAGE element on your HTML page.
	// For example, document.images.SLIDES1IMG
	this.image;

	// ID of a DIV element on your HTML page that will contain the text.
	// For example, "slides2text"
	// Note: after you set this variable, you should call
	// the update() method to update the slideshow display.
	this.textid;

	// TEXTAREA element on your HTML page.
	// For example, document.SLIDES1FORM.SLIDES1TEXT
	// This is a depracated method for displaying the text,
	// but you might want to supply it for older browsers.
	this.textarea;

	// Milliseconds to pause between slides.
	// Individual slides can override this.
	this.timeout = 3000;

	// Hook functions to be called before and after updating the slide
	// this.pre_update_hook = function() { }
	// this.post_update_hook = function() { }

	// These are private variables
	this.slides = new Array();
	this.current = 0;
	this.timeoutid = 0;
	this.user_paused = false;

	//--------------------------------------------------
	// Public methods
	//--------------------------------------------------
	this.add_slide = function(slide) 
	{
		// Add a slide to the slideshow.
		// For example:
		// SLIDES1.add_slide(new slide("s1.jpg", "link.html"))
		
		var i = this.slides.length;
		
		// Prefetch the slide image if necessary
		if (this.prefetch == -1) 
		{
			slide.load();
		}
		
		this.slides[i] = slide;
	}

	//--------------------------------------------------
	this.play = function(timeout) 
	{
		// This method implements the automatically running slideshow.
		// If you specify the "timeout" argument, then a new default
		// timeout will be set for the slideshow.
		
		// Make sure we're not already playing
		this.pause();
		
		if(!this.user_paused)
		{
			// If the timeout argument was specified (optional)
			// then make it the new default
			if (timeout) 
			{
				this.timeout = timeout;
			}
			
			// If the current slide has a custom timeout, use it;
			// otherwise use the default timeout
			if (typeof this.slides[ this.current ].timeout != 'undefined') 
			{
				timeout = this.slides[ this.current ].timeout;
			}
			else 
			{
				timeout = this.timeout;
			}

			// After the timeout, call this.loop()
			this.timeoutid = setTimeout( this.name + ".loop()", timeout);
		}
	}

	//--------------------------------------------------
	this.pause = function()
	{
		// This method stops the slideshow if it is automatically running.
		if (this.timeoutid != 0) 
		{
			clearTimeout(this.timeoutid);
			this.timeoutid = 0;
		}
	}
  
	//--------------------------------------------------
	this.pausetoggle = function(boolPausedByUser)
	{
		// This method toggles the start/stop of the slideshow
		if (boolPausedByUser) 
		{
			this.user_paused = true;
			document.getElementById('ss_play').style.display = 'inline';
			document.getElementById('ss_pause').style.display = 'none';
			this.pause();
		}
		else
		{
			this.user_paused = false;
			document.getElementById('ss_play').style.display = 'none';
			document.getElementById('ss_pause').style.display = 'inline';
			this.play();
			// Directly go to the next slide
			this.next();
		}
	}

	//--------------------------------------------------
	this.update = function() 
	{
		// This method updates the slideshow image on the page

		// Make sure the slideshow has been initialized correctly
		if (!this.valid_image()) 
		{ 
			return; 
		}

		// Call the pre-update hook function if one was specified
		if (typeof this.pre_update_hook == 'function') 
		{
			this.pre_update_hook();
		}

		// Convenience variable for the current slide
		var slide = this.slides[this.current];

		// Determine if the browser supports filters
		var dofilter = false;
		if (this.image &&
		typeof this.image.filters != 'undefined' &&
		typeof this.image.filters[0] != 'undefined') 
		{
			dofilter = true;
		}

		// Load the slide image if necessary
		slide.load();

		// Als de carrousel image geen link heeft dan moet de cursor op default staan, anders toon een handje
		if (slide.link == "") {
			document.getElementById('ss_img').style.cursor = 'Default';
			document.getElementById('ss_text_link').style.cursor = 'Default';
			document.getElementById('ss_text_link').style.textDecoration = 'None';
		} else {
			document.getElementById('ss_img').style.cursor = 'Pointer';
			document.getElementById('ss_text_link').style.cursor = 'Pointer';
			document.getElementById('ss_text_link').style.textDecoration = 'Underline';
		}


		// Apply the filters for the image transition
		if (dofilter) 
		{
			// If the user has specified a custom filter for this slide,
			// then set it now
			if (slide.filter && this.image.style && this.image.style.filter) 
			{
				this.image.style.filter = slide.filter;
			}
			this.image.filters[0].Apply();
		} 
		else 
		{
			// De browser ondersteunt geen filters, zoals bv Firefox
			for (var i = 0; i <= 1; i += (1 / 10)) 
			{
				setTimeout("setOpacity(" + i + ")", i * 1000);
			}
		}

		// Update the image.
		this.image.src = slide.image.src;
		this.image.alt = slide.image.alt;
		this.image.title = slide.image.alt;

		// Play the image transition filters
		if (dofilter) {
			this.image.filters[0].Play();
		}

		// Update the text
		this.display_text();

		// Call the post-update hook function if one was specified
		if (typeof this.post_update_hook == 'function') {
			this.post_update_hook();
		}

		// Do we need to pre-fetch images?
		if (this.prefetch > 0) 
		{
			var next, prev, count;

			// Pre-fetch the next slide image(s)
			next = this.current;
			prev = this.current;
			count = 0;
			do 
			{
				// Get the next and previous slide number
				// Loop past the ends of the slideshow if necessary
				if (++next >= this.slides.length) next = 0;
				if (--prev < 0) prev = this.slides.length - 1;

				// Preload the slide image
				this.slides[next].load();
				this.slides[prev].load();

				// Keep going until we have fetched
				// the designated number of slides

			} while (++count < this.prefetch);
		}
	}

	//--------------------------------------------------
	this.goto_slide = function(n) 
	{
		// This method jumpts to the slide number you specify.
		// If you use slide number -1, then it jumps to the last slide.
		// You can use this to make links that go to a specific slide,
		// or to go to the beginning or end of the slideshow.
		// Examples:
		// onClick="myslides.goto_slide(0)"
		// onClick="myslides.goto_slide(-1)"
		// onClick="myslides.goto_slide(5)"

		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) 
	{
		// Picks a random slide (other than the current slide) and
		// displays it.
		// If the include_current parameter is true,
		// then 
		// See also: shuffle()

		var i;

		// Make sure there is more than one slide
		if (this.slides.length > 1) 
		{
			// Generate a random slide number,
			// but make sure it is not the current slide
			do {
				i = Math.floor(Math.random()*this.slides.length);
			} while (i == this.current);

			// Display the slide
			this.goto_slide(i);
		}
	}


	//--------------------------------------------------
	this.next = function() 
	{
		// This method advances to the next slide.

		// Increment the image number
		if (this.current < this.slides.length - 1) {
			this.current++;
		} else if (this.repeat) {
			this.current = 0;
		}

		this.update();
	}


	//--------------------------------------------------
	this.previous = function() 
	{
		// This method goes to the previous slide.

		// Decrement the image number
		if (this.current > 0) {
			this.current--;
		} else if (this.repeat) {
			this.current = this.slides.length - 1;
		}

		this.update();
	}


	//--------------------------------------------------
	this.shuffle = function() 
	{
		// This method randomly shuffles the order of the slides.

		var i, i2, slides_copy, slides_randomized;

		// Create a copy of the array containing the slides
		// in sequential order
		slides_copy = new Array();
		for (i = 0; i < this.slides.length; i++) 
		{
			slides_copy[i] = this.slides[i];
		}

		// Create a new array to contain the slides in random order
		slides_randomized = new Array();

		// To populate the new array of slides in random order,
		// loop through the existing slides, picking a random
		// slide, removing it from the ordered list and adding it to
		// the random list.

		do 
		{
			// Pick a random slide from those that remain
			i = Math.floor(Math.random()*slides_copy.length);

			// Add the slide to the end of the randomized array
			slides_randomized[ slides_randomized.length ] =
			slides_copy[i];

			// Remove the slide from the sequential array,
			// so it cannot be chosen again
			for (i2 = i + 1; i2 < slides_copy.length; i2++) 
			{
				slides_copy[i2 - 1] = slides_copy[i2];
			}
			slides_copy.length--;

			// Keep going until we have removed all the slides

		} while (slides_copy.length);

		// Now set the slides to the randomized array
		this.slides = slides_randomized;
	}


	//--------------------------------------------------
	this.get_text = function() 
	{
		// This method returns the text of the current slide

		return(this.slides[ this.current ].text);
	}


	//--------------------------------------------------
	this.get_all_text = function(before_slide, after_slide) 
	{
		// Return the text for all of the slides.
		// For the text of each slide, add "before_slide" in front of the
		// text, and "after_slide" after the text.
		// For example:
		// document.write("<ul>");
		// document.write(s.get_all_text("<li>","\n"));
		// document.write("<\/ul>");

		all_text = "";

		// Loop through all the slides in the slideshow
		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) 
	{
		// Display the text for the current slide

		// If the "text" arg was not supplied (usually it isn't),
		// get the text from the slideshow
		if (!text) {
			text = this.slides[ this.current ].text;
		}

		// If a textarea has been specified,
		// then change the text displayed in it
		if (this.textarea && typeof this.textarea.value != 'undefined') {
			this.textarea.value = text;
		}

		// If a text id has been specified,
		// then change the contents of the HTML element
		if (this.textid) 
		{
			var r = this.getElementById(this.textid);
			if (!r) 
			{ 
				return false; 
			}
			if (typeof r.innerHTML == 'undefined') 
			{ 
				return false; 
			}

			// Update the text
			if (text) {
				r.innerHTML = text;
			} else {
				r.innerHTML = "<br />";
			}
		}
	}


	//--------------------------------------------------
	this.pagelink = function() 
	{
		// This method calls the pagelink() method for the current slide.

		this.slides[ this.current ].pagelink();
	}


	//--------------------------------------------------
	this.save_position = function(cookiename) 
	{
		// Saves the position of the slideshow in a cookie,
		// so when you return to this page, the position in the slideshow
		// won't be lost.

		if (!cookiename) {
			cookiename = this.name + '_slideshow';
		}

		document.cookie = cookiename + '=' + this.current;
	}


	//--------------------------------------------------
	this.restore_position = function(cookiename) 
	{
		// If you previously called slideshow_save_position(),
		// returns the slideshow to the previous state.

		//Get cookie code by Shelley Powers

		if (!cookiename) {
			cookiename = this.name + '_slideshow';
		}

		var search = cookiename + "=";

		if (document.cookie.length > 0) {
			offset = document.cookie.indexOf(search);
			// if cookie exists
			if (offset != -1) { 
				offset += search.length;
				// set index of beginning of value
				end = document.cookie.indexOf(";", offset);
				// set index of end of cookie value
				if (end == -1)
				{
					end = document.cookie.length;
				}
				this.current = parseInt(unescape(document.cookie.substring(offset, end)));
			}
		}
	}


	//--------------------------------------------------
	this.noscript = function() 
	{
		// This method is not for use as part of your slideshow,
		// but you can call it to get a plain HTML version of the slideshow
		// images and text.
		// You should copy the HTML and put it within a NOSCRIPT element, to
		// give non-javascript browsers access to your slideshow information.
		// This also ensures that your slideshow text and images are indexed
		// by search engines.

		$html = "\n";

		// Loop through all the slides in the slideshow
		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="' + slide.alt + '">';

			if (slide.link) {
				$html += "<\/a>";
			}

			if (slide.text) {
				$html += "<BR>\n" + slide.text;
			}

			$html += "<\/P>" + "\n\n";
		}

		// Make the HTML browser-safe
		$html = $html.replace(/\&/g, "&amp;" );
		$html = $html.replace(/</g, "&lt;" );
		$html = $html.replace(/>/g, "&gt;" );

		return('<pre>' + $html + '</pre>');
	}


	//==================================================
	// Private methods
	//==================================================

	//--------------------------------------------------
	this.loop = function() 
	{
		// This method is for internal use only.
		// This method gets called automatically by a JavaScript timeout.
		// It advances to the next slide, then sets the next timeout.
		// If the next slide image has not completed loading yet,
		// then do not advance to the next slide yet.

		// Make sure the next slide image has finished loading
		if (this.current < this.slides.length - 1) {
			var 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();
		}

		// Keep playing the slideshow
		this.play( );
	}


	//--------------------------------------------------
	this.valid_image = function() 
	{
		// Returns 1 if a valid image has been set for the slideshow

		if (!this.image)
		{
			return false;
		}
		else {
			return true;
		}
	}

	//--------------------------------------------------
	this.getElementById = function(element_id) 
	{
		// This method returns the element corresponding to the 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
	// I don't recommend the use of the following methods,
	// but they are included for backward compatibility.
	// You can delete them if you don't need them.
	//==================================================

	//--------------------------------------------------
	this.set_image = function(imageobject) 
	{
		// This method is deprecated; you should use
		// the following code instead:
		// s.image = document.images.myimagename;
		// s.update();

		if (!document.images)
		{
			return;
		}
		this.image = imageobject;
	}

	//--------------------------------------------------
	this.set_textarea = function(textareaobject) 
	{
		// This method is deprecated; you should use
		// the following code instead:
		// s.textarea = document.form.textareaname;
		// s.update();

		this.textarea = textareaobject;
		this.display_text();
	}

	//--------------------------------------------------
	this.set_textid = function(textidstr) 
	{
		// This method is deprecated; you should use
		// the following code instead:
		// s.textid = "mytextid";
		// s.update();
		
		this.textid = textidstr;
		this.display_text();
	}
}