/*
 * Enable the jump to a specific video based on their keyword.
 * @author Kolle Rebbe - Philipp Nolte
 *
 * @param keyword The keyword to jump to.
 * @return false
 */
function slideToCharacter(keyword) {

 // Get a list of video names in the scroll area.
 var videoItems = VSA_scrollAreas[0].scrollContent.getElementsByTagName('a');

 // Now walk through the videos and find a matching item.
 var childCount = videoItems.length;
  for (var i = 0; i < childCount; i++) {

    // If a match is found, scroll the scroll area to the desired position.
    if (videoItems[i].href.match(keyword)) {
        VSA_scrollAreas[0].scrollContent.scrollTop =  i / childCount * VSA_scrollAreas[0].scrollContent.scrollHeight - 60;
    }
  }

  // Always return false to interrupt the users event.
  return false;
}

/*
 * Added offset calculation. Enables the list being pre-scrolled
 * depending on the video the user is viewing.
 * @author Kolle Rebbe - Philipp Nolte
 *
 * @param element The box containing the video list.
 * @return The scrollTop value.
 */
function KR_CalculateScrollOffset(scrollableBox) {

  // First, get the video name from the uri (finanzen.php?v=xyz).
   var videoName = window.location.search.match(/[a-z]+$/);

   if (!videoName) {

	videoName = location.pathname.substr(location.pathname.lastIndexOf("/")+1, location.pathname.length);
	videoName = videoName.substr(0,videoName.length-5);

	if(!videoName) return 0;
	
  }

  // Now get a list of links in the list. The links carry the
  // video argument (finanzen.php?v=xyz) in their href-attribute.
   
  var videoItems = scrollableBox.getElementsByTagName('a');
  var childCount = videoItems.length;
  for (var i = 0; i < childCount; i++) {
    if (videoItems[i].href.match(videoName)) {

      
       // Calculate the scroll offset depending on the found
       // link position.
       return i / childCount * scrollableBox.scrollHeight;
    }
  }
  return 0;
}



/*
 * Original vscrollarea.js starts here.
 */

var VSA_scrollAreas = new Array();

var VSA_default_imagesPath = "/assets/images";
var VSA_default_btnUpImage = "button-up.gif";
var VSA_default_btnDownImage = "button-down.gif";
var VSA_default_scrollStep = 5;
var VSA_default_wheelSensitivity = 10;
var VSA_default_scrollbarPosition = 'right';//'left','right','inline';
var VSA_default_scrollButtonHeight = 16;
var VSA_default_scrollbarWidth = 16;

var VSA_resizeTimer = 2000;

if (window.addEventListener)
  window.addEventListener("load", VSA_initScrollbars, false);
else if (window.attachEvent)
  window.attachEvent("onload", VSA_initScrollbars);

function VSA_initScrollbars()
{
  var scrollElements = VSA_getElements("scrollable", "DIV", document, "class");
  for (var i=0; i<scrollElements.length; i++)
  {
    VSA_scrollAreas[i] = new ScrollArea(i, scrollElements[i]);
  }
}

function ScrollArea(index, elem) //constructor
{
  this.index = index;
  this.element = elem;

  var attr = this.element.getAttribute("imagesPath");
  this.imagesPath = attr ? attr : VSA_default_imagesPath;

  attr = this.element.getAttribute("btnUpImage");
  this.btnUpImage = attr ? attr : VSA_default_btnUpImage;

  attr = this.element.getAttribute("btnDownImage");
  this.btnDownImage = attr ? attr : VSA_default_btnDownImage;

  attr = Number(this.element.getAttribute("scrollStep"));
  this.scrollStep = attr ? attr : VSA_default_scrollStep;

  attr = Number(this.element.getAttribute("wheelSensitivity"));
  this.wheelSensitivity = attr ? attr : VSA_default_wheelSensitivity;

  attr = this.element.getAttribute("scrollbarPosition");
  this.scrollbarPosition = attr ? attr : VSA_default_scrollbarPosition;
  
  attr = this.element.getAttribute("scrollButtonHeight");
  this.scrollButtonHeight = attr ? attr : VSA_default_scrollButtonHeight;

  attr = this.element.getAttribute("scrollbarWidth");
  this.scrollbarWidth = attr ? attr : VSA_default_scrollbarWidth;

  this.scrolling = false;

  this.iOffsetY = 0;
  this.scrollHeight = 0;
  this.scrollContent = null;
  this.scrollbar = null;
  this.scrollup = null;
  this.scrolldown = null;
  this.scrollslider = null;
  this.scroll = null;
  this.enableScrollbar = false;
  this.scrollFactor = 1;
  this.scrollingLimit = 0;
  this.topPosition = 0;

  //functions declaration
  this.init = VSA_init;
  this.scrollUp = VSA_scrollUp;
  this.scrollDown = VSA_scrollDown;
  this.createScrollBar = VSA_createScrollBar;
  this.scrollIt = VSA_scrollIt;

  this.init();
  
}


function VSA_init()
{

  this.scrollContent = document.createElement("DIV");
  this.scrollContent.style.position = "absolute";
  this.scrollContent.innerHTML = this.element.innerHTML;
  this.scrollContent.style.overflow = "hidden";  

  this.scrollContent.style.width = this.element.offsetWidth + "px";
  this.scrollContent.style.height = this.element.offsetHeight + "px";
  
  this.element.innerHTML = "";
  this.element.style.overflow = "hidden";
  this.element.style.display = "block";
  this.element.style.visibility = "visible";
  this.element.style.position = "relative";
  this.element.appendChild(this.scrollContent);

  this.scrollContent.className = 'scroll-content';

  this.element.index = this.index;
  this.element.over = false;
  
  var _this = this;
  this.element.onmouseover = function(){
        _this.element.over = true;
    };
    this.element.onmouseout = function(){
        _this.element.over = false;
    }

  if (document.all)
  {
    this.element.onscroll = VSA_handleOnScroll;
    this.element.onresize = VSA_handleResize;
  }
  else
  {
    window.onresize = VSA_handleResize;
  }
  
  this.createScrollBar();
  
  if (window.addEventListener)
        /** DOMMouseScroll is for mozilla. */
        this.element.addEventListener('DOMMouseScroll', VSA_handleMouseWheel, false);
  /** IE/Opera. */
  this.element.onmousewheel = document.onmousewheel = VSA_handleMouseWheel;

}

function VSA_createScrollBar()
{

  if (this.scrollbar != null)
  {
    this.element.removeChild(this.scrollbar);
    this.scrollbar = null;
  }

  if (this.scrollContent.scrollHeight <= this.scrollContent.offsetHeight)
    this.enableScrollbar = false;
  else if (this.element.offsetHeight > 2*this.scrollButtonHeight)
    this.enableScrollbar = true;
  else
    this.enableScrollbar = false;

  /*
   * Added offset calculation. Enables the list being pre-scrolled
   * depending on the video the user is viewing.
   * @author Kolle Rebbe - Philipp Nolte
   */
  this.scrollContent.scrollTop = KR_CalculateScrollOffset(this.scrollContent);

  if (this.scrollContent.scrollHeight - Math.abs(this.scrollContent.scrollTop) < this.element.offsetHeight)
    this.scrollContent.style.top = 0;

  if (this.enableScrollbar)
  {

    this.scrollbar = document.createElement("DIV");
    this.element.appendChild(this.scrollbar);    
    this.scrollbar.style.position = "absolute";
    this.scrollbar.style.top = "0px";
    this.scrollbar.style.height = this.element.offsetHeight+"px";
    this.scrollbar.style.width = this.scrollbarWidth + "px";

    this.scrollbar.className = 'vscroll-bar';

    if(this.scrollbarWidth != this.scrollbar.offsetWidth)
    {
      this.scrollbarWidth = this.scrollbar.offsetHeight;
    }
    
    this.scrollbarWidth = this.scrollbar.offsetWidth;

    if(this.scrollbarPosition == 'left')
    {
      this.scrollContent.style.left = this.scrollbarWidth + 5 + "px";      
      this.scrollContent.style.width = this.element.offsetWidth - this.scrollbarWidth - 5 + "px";      
    }
    else if(this.scrollbarPosition == 'right')
    {
      this.scrollbar.style.left = this.element.offsetWidth - this.scrollbarWidth  + "px";
      this.scrollContent.style.width = this.element.offsetWidth - this.scrollbarWidth - 5 + "px";      
    }

    //create scroll up button
    this.scrollup = document.createElement("DIV");
    this.scrollup.index = this.index;
    this.scrollup.onmousedown = VSA_handleBtnUpMouseDown;
    this.scrollup.onmouseup = VSA_handleBtnUpMouseUp;
    this.scrollup.onmouseout = VSA_handleBtnUpMouseOut;
    this.scrollup.style.position = "absolute";
    this.scrollup.style.top = "0px";
    this.scrollup.style.left = "0px";    
    this.scrollup.style.height = this.scrollButtonHeight + "px";    
    this.scrollup.style.width = this.scrollbarWidth + "px";
    
    this.scrollup.innerHTML = '<img src="' + this.imagesPath + '/' + this.btnUpImage + '" border="0"/>';
    this.scrollbar.appendChild(this.scrollup);

    this.scrollup.className = 'vscroll-up';

    if(this.scrollButtonHeight != this.scrollup.offsetHeight)
    {
      this.scrollButtonHeight = this.scrollup.offsetHeight;
    }
        
    //create scroll down button
    this.scrolldown = document.createElement("DIV");
    this.scrolldown.index = this.index;
    this.scrolldown.onmousedown = VSA_handleBtnDownMouseDown;
    this.scrolldown.onmouseup = VSA_handleBtnDownMouseUp;
    this.scrolldown.onmouseout = VSA_handleBtnDownMouseOut;
    this.scrolldown.style.position = "absolute";
    this.scrolldown.style.left = "0px";    
    this.scrolldown.style.top =  this.scrollbar.offsetHeight - this.scrollButtonHeight + "px";
    this.scrolldown.style.width = this.scrollbarWidth + "px";
    this.scrolldown.innerHTML = '<img src="' + this.imagesPath + '/' + this.btnDownImage + '" border="0"/>';
    this.scrollbar.appendChild(this.scrolldown);

    this.scrolldown.className = 'vscroll-down';

    //create scroll
    this.scroll = document.createElement("DIV");
    this.scroll.index = this.index;
    this.scroll.style.position = "absolute";
    this.scroll.style.zIndex = 0;
    this.scroll.style.textAlign = "center";
    this.scroll.style.top = this.scrollButtonHeight + "px";
    this.scroll.style.left = "0px";    
    this.scroll.style.width = this.scrollbarWidth + "px";
    
    var h = this.scrollbar.offsetHeight - 2*this.scrollButtonHeight;
    this.scroll.style.height = ((h > 0) ? h : 0) + "px";
    
    this.scroll.innerHTML = '';
    this.scroll.onclick = VSA_handleScrollbarClick;
    this.scrollbar.appendChild(this.scroll);
    this.scroll.style.overflow = "hidden";

    this.scroll.className = "vscroll-line";

    //create slider
    this.scrollslider = document.createElement("DIV");
    this.scrollslider.index = this.index;
    this.scrollslider.style.position = "absolute";
    this.scrollslider.style.zIndex = 1000;
    this.scrollslider.style.textAlign = "center";
    this.scrollslider.innerHTML = '<div id="scrollslider' + this.index + '" style="padding:0;margin:0;"><div class="scroll-bar-top"></div><div class="scroll-bar-bottom"></div></div>';
    this.scrollbar.appendChild(this.scrollslider);
    
    this.subscrollslider = document.getElementById("scrollslider"+this.index);    
    this.subscrollslider.style.height = Math.round((this.scrollContent.offsetHeight/this.scrollContent.scrollHeight)*(this.scrollbar.offsetHeight - 2*this.scrollButtonHeight)) + "px";
    
    this.scrollslider.className = "vscroll-slider";
    
    this.scrollHeight = this.scrollbar.offsetHeight - 2*this.scrollButtonHeight - this.scrollslider.offsetHeight;
    this.scrollFactor = (this.scrollContent.scrollHeight - this.scrollContent.offsetHeight)/this.scrollHeight;
    this.topPosition = getRealTop(this.scrollbar) + this.scrollButtonHeight;
    /* this.scrollbarHeight = this.scrollbar.offsetHeight - 2*this.scrollButtonHeight - this.scrollslider.offsetHeight; */

    this.scrollslider.style.top = 1 / this.scrollFactor * Math.abs(this.scrollContent.scrollTop) + this.scrollButtonHeight + "px";
    this.scrollslider.style.left = "0px";
    this.scrollslider.style.width = "100%";
    this.scrollslider.onmousedown = VSA_handleSliderMouseDown;
    if (document.all)
      this.scrollslider.onmouseup = VSA_handleSliderMouseUp;
  }
  else
    this.scrollContent.style.width = this.element.offsetWidth + "px";
}

function VSA_handleBtnUpMouseDown()
{
  var sa = VSA_scrollAreas[this.index];
  sa.scrolling = true;
  sa.scrollUp();
}

function VSA_handleBtnUpMouseUp()
{
  VSA_scrollAreas[this.index].scrolling = false;
}

function VSA_handleBtnUpMouseOut()
{
  VSA_scrollAreas[this.index].scrolling = false;
}

function VSA_handleBtnDownMouseDown()
{
  var sa = VSA_scrollAreas[this.index];
  sa.scrolling = true;
  sa.scrollDown();
}

function VSA_handleBtnDownMouseUp()
{
  VSA_scrollAreas[this.index].scrolling = false;
}

function VSA_handleBtnDownMouseOut()
{
  VSA_scrollAreas[this.index].scrolling = false;
}

function VSA_scrollIt()
{
  this.scrollContent.scrollTop = this.scrollFactor * ((this.scrollslider.offsetTop + this.scrollslider.offsetHeight/2) - this.scrollButtonHeight - this.scrollslider.offsetHeight/2);
}

function VSA_scrollUp()
{
  if (this.scrollingLimit > 0)
  {
    this.scrollingLimit--;
    if (this.scrollingLimit == 0) this.scrolling = false;
  }
  if (!this.scrolling) return;
  if ( this.scrollContent.scrollTop - this.scrollStep > 0)
  {
    this.scrollContent.scrollTop -= this.scrollStep;
    this.scrollslider.style.top = 1 / this.scrollFactor * Math.abs(this.scrollContent.scrollTop) + this.scrollButtonHeight + "px";
  }
  else
  {
    this.scrollContent.scrollTop = "0";
    this.scrollslider.style.top = this.scrollButtonHeight + "px";
    return;
  }
  setTimeout("VSA_Ext_scrollUp(" + this.index + ")", 30);
}

function VSA_Ext_scrollUp(index)
{
  VSA_scrollAreas[index].scrollUp();
}

function VSA_scrollDown()
{
  if (this.scrollingLimit > 0)
  {
    this.scrollingLimit--;
    if (this.scrollingLimit == 0) this.scrolling = false;
  }
  if (!this.scrolling) return;


  this.scrollContent.scrollTop += this.scrollStep;
  this.scrollslider.style.top =  1 / this.scrollFactor * Math.abs(this.scrollContent.scrollTop) + this.scrollButtonHeight + "px";

  if (this.scrollContent.scrollTop >= (this.scrollContent.scrollHeight - this.scrollContent.offsetHeight))
  {
    this.scrollContent.scrollTop = (this.scrollContent.scrollHeight - this.scrollContent.offsetHeight);
    this.scrollslider.style.top = this.scrollbar.offsetHeight - this.scrollButtonHeight - this.scrollslider.offsetHeight + "px";
    return;
  }

  setTimeout("VSA_Ext_scrollDown(" + this.index + ")", 30);
}

function VSA_Ext_scrollDown(index)
{
  VSA_scrollAreas[index].scrollDown();
}

function VSA_handleMouseMove(evt)
{
  var sa = VSA_scrollAreas[((document.all && !window.opera) ? this.index : document.documentElement.scrollAreaIndex)];
  var posy = 0;
  if (!evt) var evt = window.event;
  
  if (evt.pageY)
    posy = evt.pageY;
  else if (evt.clientY)
    posy = evt.clientY;
      
    if (document.all && !window.opera)
    {
      posy += document.documentElement.scrollTop;
    }

  var iNewY = posy - sa.iOffsetY - getRealTop(sa.scrollbar);
    iNewY += sa.scrollButtonHeight;
    
  if (iNewY < sa.scrollButtonHeight)
    iNewY = sa.scrollButtonHeight;
  if (iNewY > (sa.scrollbar.offsetHeight - sa.scrollButtonHeight) - sa.scrollslider.offsetHeight)
    iNewY = (sa.scrollbar.offsetHeight - sa.scrollButtonHeight) - sa.scrollslider.offsetHeight;

  sa.scrollslider.style.top = iNewY + "px";

  sa.scrollIt();
}

function VSA_handleSliderMouseDown(evt)
{
  if (!(document.uniqueID && document.compatMode && !window.XMLHttpRequest))
  {
    document.onselectstart = function() { return false; }
    document.onmousedown = function() { return false; }
  }

  var sa = VSA_scrollAreas[this.index];
  if (document.all && !window.opera)
  {
    sa.scrollslider.setCapture()
    sa.iOffsetY = event.offsetY;
    sa.scrollslider.onmousemove = VSA_handleMouseMove;
  }
  else
  {
    if(window.opera)
    {
      sa.iOffsetY = event.offsetY;
    }
    else
    {
      sa.iOffsetY = evt.layerY;
    }
    document.documentElement.scrollAreaIndex = sa.index;
    document.documentElement.addEventListener("mousemove", VSA_handleMouseMove, true);
    document.documentElement.addEventListener("mouseup", VSA_handleSliderMouseUp, true);
  }
  return false;
}

function VSA_handleSliderMouseUp()
{
  if (!(document.uniqueID && document.compatMode && !window.XMLHttpRequest))
  {
    document.onmousedown = null;
    document.onselectstart = null;
  }

  if (document.all && !window.opera)
  {
    var sa = VSA_scrollAreas[this.index];
    sa.scrollslider.onmousemove = null;
    sa.scrollslider.releaseCapture();
    sa.scrollIt();
  }
  else
  {
    var sa = VSA_scrollAreas[document.documentElement.scrollAreaIndex];
    document.documentElement.removeEventListener("mousemove", VSA_handleMouseMove, true);
    document.documentElement.removeEventListener("mouseup", VSA_handleSliderMouseUp, true);
    sa.scrollIt();
  }
  return false;
}

function VSA_handleResize()
{
  if (VSA_resizeTimer)
  {
    clearTimeout(VSA_resizeTimer);
    VSA_resizeTimer = 0;
  }
  VSA_resizeTimer = setTimeout("VSA_performResizeEvent()", 100);
}

function VSA_performResizeEvent()
{
  for (var i=0; i<VSA_scrollAreas.length; i++)
    VSA_scrollAreas[i].createScrollBar();
}
function VSA_handleMouseWheel(event){
  if (this.index != null) {
    var sa = VSA_scrollAreas[this.index];
    
    if (sa.scrollbar == null) return;
    sa.scrolling = true;
    sa.scrollingLimit = sa.wheelSensitivity;
    
        var delta = 0;
        if (!event) /* For IE. */
                event = window.event;
        if (event.wheelDelta) { /* IE/Opera. */
                delta = event.wheelDelta/120;
                 
                /*if (window.opera)
                        delta = -delta;*/
        } else if (event.detail) { /** Mozilla case. */
                delta = -event.detail/3;
        }
        if (delta && sa.element.over) {
                if (delta > 0)
              sa.scrollUp();
        else
              sa.scrollDown();
        
                if (event.preventDefault)
                        event.preventDefault();
                event.returnValue = false;
        }
  }
}

function VSA_handleSelectStart()
{
  event.returnValue = false;
}

function VSA_handleScrollbarClick(evt)
{
  var sa = VSA_scrollAreas[this.index];
  var offsetY = (document.all ? event.offsetY : evt.layerY);
  
  if (offsetY < (sa.scrollButtonHeight + sa.scrollslider.offsetHeight/2))
    sa.scrollslider.style.top = sa.scrollButtonHeight + "px";
  else if (offsetY > (sa.scrollbar.offsetHeight - sa.scrollButtonHeight - sa.scrollslider.offsetHeight))
    sa.scrollslider.style.top = sa.scrollbar.offsetHeight - sa.scrollButtonHeight - sa.scrollslider.offsetHeight + "px";
  else
  {
    sa.scrollslider.style.top = offsetY + sa.scrollButtonHeight - sa.scrollslider.offsetHeight/2 + "px";
  }
  sa.scrollIt();
}

function VSA_handleOnScroll()
{
  //event.srcElement.doScroll("pageUp");
}

//--- common functions ----

function VSA_getElements(attrValue, tagName, ownerNode, attrName) //get Elements By Attribute Name
{
  if (!tagName) tagName = "*";
  if (!ownerNode) ownerNode = document;
  if (!attrName) attrName = "name";
  var result = [];
  var nl = ownerNode.getElementsByTagName(tagName);
  for (var i=0; i<nl.length; i++)
  {
  //  if (nl.item(i).getAttribute(attrName) == attrValue)
//    result.push(nl.item(i));
    if (nl.item(i).className.indexOf(attrValue) != -1)
    result.push(nl.item(i));
  }
  return result;
}

var _ie = false;
if(navigator.userAgent.toLowerCase().indexOf("msie") != -1 && navigator.userAgent.toLowerCase().indexOf("opera") == -1) _ie = true;

function getRealTop(elem)
{
  if(_ie) {
    var nTop = 0;
    if(elem)
    {
      do
      {
        nTop += elem.offsetTop - elem.scrollTop;
        elem = elem.offsetParent;
      }
      while(elem)
    }
    return nTop;
  }
  else {
    var posTop = 0;
    while (elem.offsetParent) {
      posTop += elem.offsetTop;
      elem = elem.offsetParent;
    }
    var _res = new Object();
    return posTop;
  }
}