/* slidy.js

   Copyright (c) 2005 W3C (MIT, ERCIM, Keio), All Rights Reserved.

   W3C liability, trademark, document use and software licensing

   rules apply, see:

   http://www.w3.org/Consortium/Legal/copyright-documents

   http://www.w3.org/Consortium/Legal/copyright-software

*/

var ns_pos = (typeof window.pageYOffset!='undefined');

var khtml = ((navigator.userAgent).indexOf("KHTML") >= 0 ? true : false);

var opera = ((navigator.userAgent).indexOf("Opera") >= 0 ? true : false);

var ie7 = (!ns_pos && navigator.userAgent.indexOf("MSIE 7") != -1);

window.onload = startup; // equivalent to onload on body element

// IE only event handlers to ensure all slides are printed

// I don't yet know how to emulate these for other browsers

window.onbeforeprint = beforePrint;

window.onafterprint = afterPrint;

// hack to hide slides while loading

setTimeout(hideAll, 50);

function hideAll()

{

  if (document.body)

    document.body.style.visibility = "hidden";

  else

    setTimeout(hideAll, 50);

}

var slidenum = 0;     // integer slide count: 0, 1, 2, ...

var slides;           // set to array of slide div's

var slideNumElement;  // element containing slide number

var notes;            // set to array of handout div's

var backgrounds;      // set to array of background div's

var toolbar;          // element containing toolbar

var title;            // document title

var lastShown = null; // last incrementally shown item

var eos = null;       // span element for end of slide indicator

var toc = null;       // table of contents

var outline = null;   // outline element with the focus

var selectedTextLen;  // length of drag selection on document

var viewAll = 0;      // 1 to view all slides + handouts

var wantToolbar = 1;   // 0 if toolbar isn't wanted

var mouseClickEnabled = true;  // enables left click for next slide

var scrollhack = 0;   // IE work around for position: fixed

var helpAnchor;  // used for keyboard focus hack in showToolbar()

var helpPage = "http://www.w3.org/Talks/Tools/Slidy/help.html";

var helpText = "Navigate with mouse click, space bar, Cursor Left/Right, " +

               "or Pg Up and Pg Dn. Use S and B to change font size.";

var sizeIndex = 0;

var sizeAdjustment = 0;

var sizes = new Array("10pt", "12pt", "14pt", "16pt", "18pt", "20pt",

                      "22pt", "24pt", "26pt", "28pt", "30pt", "32pt");

var okayForIncremental = incrementalElementList();

// needed for efficient resizing

var lastWidth = 0;

var lastHeight = 0;

// Needed for cross browser support for relative width/height on

// object elements. The work around is to save width/height attributes

// and then to recompute absolute width/height dimensions on resizing

var objects;

// updated to language specified by html file

var lang = "en";

//var localize = {};

// for each language there is an associative array

var strings_es = {

  "slide":"pág.",

  "help?":"Ayuda",

  "contents?":"Índice",

  "table of contents":"tabla de contenidos",

  "Table of Contents":"Tabla de Contenidos",

  "restart presentation":"Reiniciar presentación",

  "restart?":"Inicio"

   };

strings_es[helpText] =

    "Utilice el ratón, barra espaciadora, teclas Izda/Dcha, " +

    "o Re pág y Av pág. Use S y B para cambiar el tamaño de fuente.";

var strings_ca = {

 "slide":"pàg..",

 "help?":"Ajuda",

 "contents?":"Índex",

 "table of contents":"taula de continguts",

 "Table of Contents":"Taula de Continguts",

 "restart presentation":"Reiniciar presentació",

 "restart?":"Inici"

  };

strings_ca[helpText] =

   "Utilitzi el ratolí, barra espaiadora, tecles Esq./Dta. " +

   "o Re pàg y Av pàg. Usi S i B per canviar grandària de font.";

var strings_nl = {

  "slide":"pagina",

  "help?":"Help?",

  "contents?":"Inhoud?",

  "table of contents":"inhoudsopgave",

  "Table of Contents":"Inhoudsopgave",

  "restart presentation":"herstart presentatie",

  "restart?":"Herstart?"

   };

strings_nl[helpText] =

    "Navigeer d.m.v. het muis, spatiebar, Links/Rechts toetsen, " +

    "of PgUp en PgDn. Gebruik S en B om de karaktergrootte te veranderen.";

var strings_de = {

  "slide":"Seite",

  "help?":"Hilfe",

  "contents?":"Übersicht",

  "table of contents":"Inhaltsverzeichnis",

  "Table of Contents":"Inhaltsverzeichnis",

  "restart presentation":"Präsentation neu starten",

  "restart?":"Neustart"

   };

strings_de[helpText] =

    "Benutzen Sie die Maus, Leerschlag, die Cursortasten links/rechts oder " +

    "Page up/Page Down zum Wechseln der Seiten und S und B für die Schriftgrösse.";

var strings_pl = {

  "slide":"slajd",

  "help?":"pomoc?",

  "contents?":"spis treści?",

  "table of contents":"spis treści",

  "Table of Contents":"Spis Treści",

  "restart presentation":"Restartuj prezentację",

  "restart?":"restart?"

   };

strings_pl[helpText] =

    "Zmieniaj slajdy klikając myszą, naciskając spację, strzałki lewo/prawo" +

    "lub PgUp / PgDn. Użyj klawiszy S i B, aby zmienić rozmiar czczionki.";

var strings_fr = {

  "slide":"page",

  "help?":"Aide",

  "contents?":"Index",

  "table of contents":"table des matières",

  "Table of Contents":"Table des matières",

  "restart presentation":"Recommencer l'exposé",

  "restart?":"Début"

  };

strings_fr[helpText] =

    "Naviguez avec la souris, la barre d'espace, les flèches " +

    "gauche/droite ou les touches Pg Up, Pg Dn. Utilisez " +

    "les touches S et B pour modifier la taille de la police.";

var strings_hu = {

  "slide":"oldal",

  "help?":"segítség",

  "contents?":"tartalom",

  "table of contents":"tartalomjegyzék",

  "Table of Contents":"Tartalomjegyzék",

  "restart presentation":"bemutató újraindítása",

  "restart?":"újraindítás"

   };

strings_hu[helpText] =

    "Az oldalak közti lépkedéshez kattintson az egérrel, vagy " +

    "használja a szóköz, a bal, vagy a jobb nyíl, illetve a Page Down, " +

    "Page Up billentyűket. Az S és a B billentyűkkel változtathatja " +

    "a szöveg méretét.";

var strings_it = {

  "slide":"pag.",

  "help?":"Aiuto",

  "contents?":"Indice",

  "table of contents":"indice",

  "Table of Contents":"Indice",

  "restart presentation":"Ricominciare la presentazione",

  "restart?":"Inizio"

   };

strings_it[helpText] =

    "Navigare con mouse, barra spazio, frecce sinistra/destra o " +

    "PgUp e PgDn. Usare S e B per cambiare la dimensione dei caratteri.";

var strings_el = {

  "slide":"σελίδα",

  "help?":"βοήθεια;",

  "contents?":"περιεχόμενα;",

  "table of contents":"πίνακας περιεχομένων",

  "Table of Contents":"Πίνακας Περιεχομένων",

  "restart presentation":"επανεκκίνηση παρουσίασης",

  "restart?":"επανεκκίνηση;"

   };

strings_el[helpText] =

  "Πλοηγηθείτε με το κλίκ του ποντικιού, το space, τα βέλη αριστερά/δεξιά, " +

  "ή Page Up και Page Down. Χρησιμοποιήστε τα πλήκτρα S και B για να αλλάξετε " +

  "το μέγεθος της γραμματοσειράς.";

var strings_ja = {

  "slide":"スライド",

  "help?":"ヘルプ",

  "contents?":"目次",

  "table of contents":"目次を表示",

  "Table of Contents":"目次",

  "restart presentation":"最初から再生",

  "restart?":"最初から"

};

strings_ja[helpText] =

    "マウス左クリック ・ スペース ・ 左右キー " +

    "または Page Up ・ Page Downで操作， S ・ Bでフォントサイズ変更";

// each such language array is declared in the localize array

// used indirectly as in help.innerHTML = "help".localize();

var localize = {

     "es":strings_es,

     "ca":strings_ca,

     "nl":strings_nl,

     "de":strings_de,

     "pl":strings_pl,

     "fr":strings_fr,

     "hu":strings_hu,

     "it":strings_it,

     "el":strings_el,

     "jp":strings_ja

   };

/* general initialization */

function startup()

{

   // find human language from html element

   // for use in localizing strings

   lang = document.body.parentNode.getAttribute("lang");

   if (!lang)

     lang = document.body.parentNode.getAttribute("xml:lang");

   if (!lang)

     lang = "en";

   document.body.style.visibility = "visible";

   title = document.title;

   toolbar = addToolbar();

   wrapImplicitSlides();

   slides = collectSlides();

   notes = collectNotes();

   objects = document.body.getElementsByTagName("object");

   backgrounds = collectBackgrounds();

   patchAnchors();

   slidenum = findSlideNumber(location.href);

   window.offscreenbuffering = true;

   sizeAdjustment = findSizeAdjust();

   hideImageToolbar();  // suppress IE image toolbar popup

   initOutliner();  // activate fold/unfold support

   if (slides.length > 0)

   {

      var slide = slides[slidenum];

      slide.style.position = "absolute";

      if (slidenum > 0)

      {

         setVisibilityAllIncremental("visible");

         lastShown = previousIncrementalItem(null);

         setEosStatus(true);

      }

      else

      {

         lastShown = null;

         setVisibilityAllIncremental("hidden");

         setEosStatus(!nextIncrementalItem(lastShown));

      }

      setLocation();

   }

   toc = tableOfContents();

   hideTableOfContents();

   // bind event handlers

   document.onclick = mouseButtonClick;

   document.onmouseup = mouseButtonUp;

   document.onkeydown = keyDown;

   window.onresize  = resized;

   window.onscroll = scrolled;

   singleSlideView();

   setLocation();

   resized();

   if (ie7)

     setTimeout("ieHack()", 100);

   showToolbar();

}

// add localize method to all strings for use

// as in help.innerHTML = "help".localize();

String.prototype.localize = function()

{

  if (this == "")

    return this;

  // try full language code, e.g. en-US

  var s, lookup = localize[lang];

  if (lookup)

  {

    s = lookup[this];

    if (s)

      return s;

  }

  // try en if undefined for en-US

  var lg = lang.split("-");

  if (lg.length > 1)

  {

    lookup = localize[lg[0]];

    if (lookup)

    {

      s = lookup[this];

      if (s)

        return s;

    }

  }

  // otherwise string as is

  return this;

}

// suppress IE's image toolbar pop up

function hideImageToolbar()

{

  if (!ns_pos)

  {

    var images = document.getElementsByTagName("IMG");

    for (var i = 0; i < images.length; ++i)

      images[i].setAttribute("galleryimg", "no");

  }

}

// hack to persuade IE to compute correct document height

// as needed for simulating fixed positioning of toolbar

function ieHack()

{

   window.resizeBy(0,-1);

   window.resizeBy(0, 1);

}

// Firefox reload SVG bug work around

function reload(e)

{

   if (!e)

      var e = window.event;

   hideBackgrounds();

   setTimeout("document.reload();", 100);

   stopPropagation(e);

   e.cancel = true;

   e.returnValue = false;

   return false;

}

// Safari and Konqueror don't yet support getComputedStyle()

// and they always reload page when location.href is updated

function isKHTML()

{

   var agent = navigator.userAgent;

   return (agent.indexOf("KHTML") >= 0 ? true : false);

}

function resized()

{

   var width = 0;

   if ( typeof( window.innerWidth ) == 'number' )

      width = window.innerWidth;  // Non IE browser

   else if (document.documentElement && document.documentElement.clientWidth)

      width = document.documentElement.clientWidth;  // IE6

   else if (document.body && document.body.clientWidth)

      width = document.body.clientWidth; // IE4

   var height = 0;

   if ( typeof( window.innerHeight ) == 'number' )

      height = window.innerHeight;  // Non IE browser

   else if (document.documentElement && document.documentElement.clientHeight)

      height = document.documentElement.clientHeight;  // IE6

   else if (document.body && document.body.clientHeight)

      height = document.body.clientHeight; // IE4

   if (height && (width/height > 1.05*1024/768))

   {

     width = height * 1024.0/768;

   }

   // IE fires onresize even when only font size is changed!

   // so we do a check to avoid blocking < and > actions

   if (width != lastWidth || height != lastHeight)

   {

      if (width >= 1100)

         sizeIndex = 5;    // 4

      else if (width >= 1000)

         sizeIndex = 4;    // 3

      else if (width >= 800)

         sizeIndex = 3;    // 2

      else if (width >= 600)

         sizeIndex = 2;    // 1

      else if (width)

         sizeIndex = 0;

      // add in font size adjustment from meta element e.g.

      // <meta name="font-size-adjustment" content="-2" />

      // useful when slides have too much content ;-)

      if (0 <= sizeIndex + sizeAdjustment &&

             sizeIndex + sizeAdjustment < sizes.length)

        sizeIndex = sizeIndex + sizeAdjustment;

      // enables cross browser use of relative width/height

      // on object elements for use with SVG and Flash media

      adjustObjectDimensions(width, height);

      document.body.style.fontSize = sizes[sizeIndex];

      lastWidth = width;

      lastHeight = height;

      // force reflow to work around Mozilla bug

      //if (ns_pos)

      {

         var slide = slides[slidenum];

         hideSlide(slide);

         showSlide(slide);

      }

      // force correct positioning of toolbar

      refreshToolbar(200);

   }

}

function scrolled()

{

   if (toolbar && !ns_pos && !ie7)

   {

      hackoffset = scrollXOffset();

      // hide toolbar

      toolbar.style.display = "none";

      // make it reappear later

      if (scrollhack == 0 && !viewAll)

      {

         setTimeout(showToolbar, 1000);

         scrollhack = 1;

      }

   }

}

// used to ensure IE refreshes toolbar in correct position

function refreshToolbar(interval)

{

   if (!ns_pos && !ie7)

   {

     hideToolbar();

     setTimeout(showToolbar, interval);

   }

}

// restores toolbar after short delay

function showToolbar()

{

   if (wantToolbar)

   {

      if (!ns_pos)

      {

         // adjust position to allow for scrolling

         var xoffset = scrollXOffset();

         toolbar.style.left = xoffset;

         toolbar.style.right = xoffset;

         // determine vertical scroll offset

         //var yoffset = scrollYOffset();

         // bottom is doc height - window height - scroll offset

         //var bottom = documentHeight() - lastHeight - yoffset

         //if (yoffset > 0 || documentHeight() > lastHeight)

         //   bottom += 16;  // allow for height of scrollbar

         toolbar.style.bottom = 0; //bottom;

      }

      toolbar.style.display = "block";

      toolbar.style.visibility = "visible";

   }

   scrollhack = 0;

   // set the keyboard focus to the help link on the

   // toolbar to ensure that document has the focus

   // IE doesn't always work with window.focus()

   // and this hack has benefit of Enter for help

   try

   {

     if (!opera)

       helpAnchor.focus();

   }

   catch (e)