/*==================================================*
 $Id: slideshow.js,v 1.16 2003/10/14 12:39:00 pat Exp $
 Copyright 2000-2003 Patrick Fitzgerald
 http://slideshow.barelyfitz.com/

 Additional Scripting Copyright 2006 Plain Games, Inc.
 *==================================================*/

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() {
    //load the image

    if (!document.images) { return; }

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

  this.hotlink = function() {
    //link url

    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;

  // Number of images to pre-fetch.
  // -1 = preload all images.
  this.prefetch = 2;
  this.image;
  this.textid = "headlinetext";
  this.textarea;
  this.timeout = 4000;
  this.slides = new Array();
  this.current = 0;
  this.timeoutid = 0;

  this.add_slide = function(slide) {
    //add image

    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() {
    //stops the show if it is automatically running.

    if (this.timeoutid != 0) {

      clearTimeout(this.timeoutid);
      this.timeoutid = 0;

    }
  }


  this.update = function() {
    //updates image on the page

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

    if (typeof this.pre_update_hook == 'function') {
      this.pre_update_hook();
    }

    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 image if necessary
    slide.load();

    // 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();
    }

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

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

    // Update the text
    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) {
    //select slide

    if (n == -1) {
      n = this.slides.length - 1;
    }

    if (n < this.slides.length && n >= 0) {
      this.current = n;
    }

    this.update();
  }

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

	this.goforward();
    this.update();
  }

this.goforward = function() {
// make it so the current one is always in position #1

var slide = this.slides[0];
    for (var i=0; i < this.slides.length-1; i++) {

	this.slides[i] = this.slides[i+1];
 	 }

   this.slides[this.slides.length-1] = slide;
	this.current = 0;

	document.smimg1.src=this.slides[0].tsrc;
	document.smimg2.src=this.slides[1].tsrc;
	document.smimg3.src=this.slides[2].tsrc;
	document.smimg4.src=this.slides[3].tsrc;
	document.smimg5.src=this.slides[4].tsrc;
}

this.gobackward = function() {
// make it so the current one is always in position #1

var slide = this.slides[0];
    for (var i=0; i < this.slides.length-1; i++) {

	this.slides[i] = this.slides[i+1];
 	 }

   this.slides[this.slides.length-1] = slide;
	this.current = 0;

	document.smimg1.src=this.slides[0].tsrc;
	document.smimg2.src=this.slides[1].tsrc;
	document.smimg3.src=this.slides[2].tsrc;
	document.smimg4.src=this.slides[3].tsrc;
	document.smimg5.src=this.slides[4].tsrc;
}

this.select = function(s) {

	for (var i = 0; i < s; i++) {
		this.goforward();
	}

	if (s == -1) {
		this.gobackward();
		}

this.update();
clearTimeout(this.timeoutid);
this.timeoutid = setTimeout( this.name + ".loop()", this.timeout);


}

  this.get_text = function() {
    //returns 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.

    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 (!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) {
    // set current position in cookie

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

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

  this.restore_position = function(cookiename) {
  // 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.loop = function() {
    //advances to the next slide, then sets the next timeout.

    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() {
    // 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) {
    //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;
    }
  }
}