// ---------------------------------------------------------------------------------
  // Done by Paul Knecht in 2011
  // Don't copy without permission!
  // ---------------------------------------------------------------------------------


  // ---------------------------------------------------------------------------------
  // Globale Variablen registrieren
  // ---------------------------------------------------------------------------------
  var cats;
  var preloadTimer;
  var scrollSpeed = 20;
  var scrollSteps = 20;

  
  var cat = '';<br />
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  // ---------------------------------------------------------------------------------
  // Zum Start einer Fotostory scrollen
  // ---------------------------------------------------------------------------------
  
  function scroller(storyNr, stepnrs, step, diff, faktor, pos) {

    var divCounter = document.getElementById('stories').getElementsByTagName('div')[0].getElementsByTagName('div').length;
    var divStory = document.getElementById('stories').getElementsByTagName('div')[Math.ceil((storyNr*divCounter)+storyNr)];
      
    if(!stepnrs) {
      if (window.pageYOffset) pos = window.pageYOffset;
      else pos = document.documentElement.scrollTop;
      diff = divStory.offsetTop-pos-30;
      if(diff > 0) scrolllength = diff;
      else scrolllength = diff*-1;
      
      stepnrs = Math.round(scrolllength/scrollSteps);
      if(diff < 0) faktor = -(scrolllength/2)/(Math.pow((stepnrs/2),2));
      else faktor = (scrolllength/2)/(Math.pow((stepnrs/2),2));
    }

    if(stepnrs > 0) {
      if(!step) var step = 1;
      else step++;

      if(step <= stepnrs/2) goTo = Math.round(pos)+Math.round( faktor*Math.pow(step,2) );
      else goTo = Math.round(pos)+Math.round( -faktor*Math.pow(step-(stepnrs), 2)+Math.round(diff) );
      
      window.scrollTo(0, goTo);
      if(step < stepnrs)
        timerScroller = setTimeout("scroller('"+storyNr+"', '"+stepnrs+"', '"+step+"', '"+diff+"', '"+faktor+"', '"+pos+"')", scrollSpeed);
      else actStory(storyNr);
    } else actStory(storyNr);
  }


  // ---------------------------------------------------------------------------------
  // Positioning arrows
  // ---------------------------------------------------------------------------------

  function posArrow() {
    if(window.location.hash)
      var picNr = parseInt(window.location.hash.substr(1));
    else
      var picNr = 1;

    hideArrow(picNr);
  }

  // ---------------------------------------------------------------------------------
  // Hiding arrows, if there's no next or prev. photos
  // ---------------------------------------------------------------------------------
  
  function hideArrow(picNr) {
    if(picNr == 1) {
      document.getElementById('prev').onclick = function onclick(event) {};
      document.getElementById('prev').style.visibility = "hidden";
      document.getElementById('next').style.visibility = "visible";
    } else if(picNr == pics.length) {
      document.getElementById('next').onclick = function onclick(event) {};
      document.getElementById('next').style.visibility = "hidden";
      document.getElementById('prev').style.visibility = "visible";
    } else {
      document.getElementById('prev').style.visibility = "visible";
      document.getElementById('next').style.visibility = "visible";
    }
  } 
  
   
  // ---------------------------------------------------------------------------------
  // "openPhoto" - Ãndern des aktiven Fotos
  // ---------------------------------------------------------------------------------

  function openPhoto(picNr) {
    window.scrollTo(0, 0);
    if(!picNr)
      if(window.location.hash)
        var picNr = parseInt(window.location.hash.substr(1));
      else
        var picNr = 1;

    document.getElementById('photo').src = 'img/loading.png';
    document.getElementById('photo').src = 'stories/'+cat+'/big/'+pics[picNr-1];
    if(picsHigh[picNr-1] == '1')
      document.getElementById('photo').className = 'high';
    else if(picsHigh[picNr-1] == '2')
      document.getElementById('photo').className = 'medium';
    else
      document.getElementById('photo').className = 'normal';
    document.getElementById('subtitle').innerHTML = '<p>'+picsComment[picNr-1]+'</p>';
    window.location.hash = picNr;

    document.getElementById('prev').onclick = function onclick(event) { openPhoto(picNr-1) };
    document.getElementById('next').onclick = function onclick(event) { openPhoto(picNr+1) };

    hideArrow(picNr);
  }

  

  // ---------------------------------------------------------------------------------
  // Preloading photos
  // ---------------------------------------------------------------------------------
  
  pic00 = new Array();
  pic001 = new Image();
  pic001.src = 'img/loading.png';
    
  function preloadPics(picNr) {
    if(picNr+1 < pics.length) {
      pic00[parseInt(picNr)+1] = new Image();
      pic00[parseInt(picNr)+1].src = 'stories/'+cat+'/big/'+pics[picNr+1];
      preloadDone(parseInt(picNr)+1);
    } 
  }

  function preloadDone(picNr) {
    if(pic00[picNr].complete)
      preloadPics(picNr);
    else
      preloadTimer = window.setTimeout("preloadDone("+picNr+")",100);  
  }

  
  // ---------------------------------------------------------------------------------
  // Fader
  // ---------------------------------------------------------------------------------
  
  function fader(element, dir) {
    var time = 50;
    var test = 0;
    var object = document.getElementById(element).style; 

    if(dir == 'in') {
      var count = 10;
    } else if(dir == 'out') {
      var count = -10;
    }
    if((dir == 'in' && object.opacity < 1) || (dir == 'out' && object.opacity > 0)) {
      test = 1;
      opacv = (object.opacity*100)+count; 
      object.opacity = (opacv / 100); 
      object.MozOpacity = (opacv / 100); 
      object.KhtmlOpacity = (opacv / 100); 
      object.filter = "alpha(opacity=" + opacv + ")";
    } else if (dir == 'out' && object.opacity == 0) {
      object.visibility = 'hidden';
    } else if (dir == 'in' && object.opacity == 0) {
      object.visibility = 'visible';
    }
    
    if(test == 1) {
      timerFader = setTimeout("fader('"+element+"', '"+dir+"')", time);
    }
  }