function convertToId(search)
{
  var result = '';
  for (i=0;i<search.length;i++)
  {
    var c = search.charAt(i);
    var cn = c.charCodeAt(0);
    if (c.match(/[a-z0-9]/))
    {
      result+=c;
    }
    else if (cn<16) 
    {
      result+="_0"+cn.toString(16);
    }
    else 
    {
      result+="_"+cn.toString(16);
    }
  }
  return result;
}

function getXPos(item)
{
  var x = 0;
  if (item.offsetWidth)
  {
    while (item && item!=document.body)
    {
      x   += item.offsetLeft;
      item = item.offsetParent;
    }
  }
  return x;
}

function getYPos(item)
{
  var y = 0;
  if (item.offsetWidth)
  {
     while (item && item!=document.body)
     {
       y   += item.offsetTop;
       item = item.offsetParent;
     }
  }
  return y;
}

/* A class handling everything associated with the search panel.

   Parameters:
   name - The name of the global variable that will be 
          storing this instance.  Is needed to be able to set timeouts.
   resultPath - path to use for external files
*/
function SearchBox(name, resultsPath, inFrame)
{
  if (!name || !resultsPath) {  alert("Missing parameters to SearchBox."); }
   
  // ---------- Instance variables
  this.name                  = name;
  this.resultsPath           = resultsPath;
  this.keyTimeout            = 0;
  this.keyTimeoutLength      = 500;
  this.closeSelectionTimeout = 300;
  this.lastSearchValue       = "";
  this.lastResultsPage       = "";
  this.hideTimeout           = 0;
  this.searchTopic           = "all";
  this.searchActive          = false;
  this.insideFrame           = inFrame;

  // ----------- DOM Elements

  this.DOMSearchField = function()
  {  return document.getElementById("MSearchField");  }

  this.DOMSearchSelect = function()
  {  return document.getElementById("MSearchSelect");  }

  this.DOMSearchSelectWindow = function()
  {  return document.getElementById("MSearchSelectWindow");  }

  this.DOMPopupSearchResults = function()
  {  return document.getElementById("MSearchResults");  }

  this.DOMPopupSearchResultsWindow = function()
  {  return document.getElementById("MSearchResultsWindow");  }

  this.DOMSearchResultWindowClose = function()
  {  return document.getElementById("MSearchResultsWindowClose"); }

  this.DOMSearchBox = function()
  {  return document.getElementById("MSearchBox");  }

  // ------------ Event Handlers

  // Called when focus is added or removed from the search field.
  this.OnSearchFieldFocus = function(isActive)
  {
    this.Activate(isActive);
  }

  this.OnSearchSelectShow = function()
  {
    var searchSelectWindow = this.DOMSearchSelectWindow();
    var searchField        = this.DOMSearchSelect();

    if (this.insideFrame)
    {
      var left = getXPos(searchField);
      var top  = getYPos(searchField);
      left += searchField.offsetWidth + 6;
      top += searchField.offsetHeight;

      // show search selection popup
      searchSelectWindow.style.display='block';
      left -= searchSelectWindow.offsetWidth;
      searchSelectWindow.style.left =  left + 'px';
      searchSelectWindow.style.top  =  top  + 'px';
    }
    else
    {
      var left = getXPos(searchField);
      var top  = getYPos(searchField);
      top += searchField.offsetHeight;

      // show search selection popup
      searchSelectWindow.style.display='block';
      searchSelectWindow.style.left =  left + 'px';
      searchSelectWindow.style.top  =  top  + 'px';
    }

    // stop selection hide timer
    if (this.hideTimeout) 
    {
      clearTimeout(this.hideTimeout);
      this.hideTimeout=0;
    }
    return false; // to avoid "image drag" default event
  }

  this.OnSearchSelectHide = function()
  {
    this.hideTimeout = setTimeout(this.name +".CloseSelectionWindow()",
                                  this.closeSelectionTimeout);
  }

  // Called when the content of the search field is changed.
  this.OnSearchFieldChange = function()
  {
    if (this.keyTimeout) // kill running timer
    {
      clearTimeout(this.keyTimeout);
      this.keyTimeout = 0;
    }

    // strip whitespaces
    var searchValue = this.DOMSearchField().value.replace(/ +/g, "");

    if (searchValue != this.lastSearchValue) // search value has changed
    {
      if (searchValue != "") // non-empty search
      {
        // set timer for search update
        this.keyTimeout = setTimeout(this.name + '.Search()',
                                     this.keyTimeoutLength);
      }
      else // empty search field
      {
        this.DOMPopupSearchResultsWindow().style.display = 'none';
        this.lastSearchValue = '';
      }
    }
  }

  // Called when an search filter selection is made.
  // set item with index id as the active item
  this.OnSelectItem = function(id,topic)
  {
    var i,j=0;
    var win=this.DOMSearchSelectWindow(); 
    for (i=0;i<win.childNodes.length;i++)
    {
      var child = win.childNodes[i]; // get span within a
      if (child.className=='SelectItem')
      {
        var node = child.firstChild;
	if (j==id)
	{
          // add a tickmark: see http://doogalbellend.blogspot.com/2007/05/even-more-on-tick-marks-in-html.html
          node.innerHTML='&bull;';
        } 
        else
        {
          node.innerHTML='&nbsp;';
        }
        j++;
      }
    }
    if (topic)
    {
      this.searchTopic = topic;
      var searchValue = this.DOMSearchField().value.replace(/ +/g, "");
      if (searchValue != "" && this.searchActive) // something was found -> do a search
      {
        this.Search();
      }
    }
    else
    {
      this.Activate(false);
    }
  }

  this.OnCloseHighlight = function(active)
  {
    var close = this.DOMSearchResultWindowClose();
    if (active)
    {
      close.firstChild.src = this.resultsPath + '/close_active.png';
    }
    else
    {
      close.firstChild.src = this.resultsPath + '/close.png';
    }
    return false;
  }

  // --------- Actions

  // Closes the results window.
  this.CloseResultsWindow = function()
  {
    this.DOMPopupSearchResultsWindow().style.display = "none";
    this.Activate(false);
  }

  this.CloseSelectionWindow = function()
  {
    this.DOMSearchSelectWindow().style.display = "none";
  }

  // Performs a search.
  this.Search = function()
  {
    this.keyTimeout = 0;

    // strip leading whitespace
    var searchValue = this.DOMSearchField().value.replace(/^ +/, "");

    var code = searchValue.toLowerCase().charCodeAt(0);
    var hexCode;
    if (code<16) 
    {
      hexCode="0"+code.toString(16);
    }
    else 
    {
      hexCode=code.toString(16);
    }

    var resultsPage;
    var resultsPageWithSearch;
    var hasResultsPage;

    // indexSectionsWithContent is defined in searchdata.js
    if (indexSectionsWithContent[this.searchTopic].charAt(code-32) == '1')
    {
       resultsPage = this.resultsPath + '/' + this.searchTopic + '_' + hexCode + '.html';
       resultsPageWithSearch = resultsPage+'?'+escape(searchValue);
       hasResultsPage = true;
    }
    else // nothing available for this search term
    {
       resultsPage = this.resultsPath + '/nomatches.html';
       resultsPageWithSearch = resultsPage;
       hasResultsPage = false;
    }

    window.frames.MSearchResults.location.href = resultsPageWithSearch;  
    var domPopupSearchResultsWindow = this.DOMPopupSearchResultsWindow();

    if (domPopupSearchResultsWindow.style.display!="block")
    {
       if (this.insideFrame)
       {
         var domSearchBox = this.DOMSearchBox();
         var domPopupSearchResults = this.DOMPopupSearchResults();
         this.DOMSearchResultWindowClose().style.textAlign = 'left';
         domPopupSearchResultsWindow.style.position = 'relative';
         domPopupSearchResultsWindow.style.display  = 'block';
         var width = document.body.clientWidth - 8; // the -8 is for IE :-(
         domPopupSearchResultsWindow.style.width    = width + 'px';
         domPopupSearchResults.style.width          = width + 'px';
       }
       else
       {
         var domSearchField = this.DOMSearchField();
         var domPopupSearchResults = this.DOMPopupSearchResults();
         var left = getXPos(domSearchField) + domSearchField.offsetWidth;
         var top  = getYPos(domSearchField) + domSearchField.offsetHeight + 1;
         domPopupSearchResultsWindow.style.display = 'block';
         left -= domPopupSearchResults.offsetWidth;
         domPopupSearchResultsWindow.style.top     = top  + 'px';
         domPopupSearchResultsWindow.style.left    = left + 'px';
       }
    }

    this.lastSearchValue = searchValue;
    this.lastResultsPage = resultsPage;
  }

  // -------- Activation Functions

  // Activates or deactivates the search panel, resetting things to 
  // their default values if necessary. 
  this.Activate = function(isActive)
  {
    if (isActive || // open it
        this.DOMPopupSearchResultsWindow().style.display == 'block' 
       )
    {
      this.DOMSearchBox().className = 'MSearchBoxActive';

      var searchField = this.DOMSearchField();

      if (searchField.value == 'Search') // clear "Search" term upon entry
      {  
        searchField.value = '';  
        this.searchActive = true;
      }
    }
    else if (!isActive) // directly remove the panel
    {
      this.DOMSearchBox().className = 'MSearchBoxInactive';
      this.DOMSearchField().value   = 'Search';
      this.searchActive             = false;
      this.lastSearchValue          = ''
      this.lastResultsPage          = '';
    }
  }
}

// -----------------------------------------------------------------------

// The class that handles everything on the search results page.
function SearchResults(name)
{
    // The number of matches from the last run of <Search()>.
    this.lastMatchCount = 0;

    // Toggles the visibility of the passed element ID.
    this.Toggle = function(id)
    {
      var parentElement = document.getElementById(id);
      var element = parentElement.firstChild;

      while (element && element!=parentElement)
      {
        if (element.nodeName == 'DIV' && element.className == 'SRChildren')
        {
          if (element.style.display == 'block')
          {  
            element.style.display = 'none';  
          }
          else
          {  
            element.style.display = 'block';  
          }
        }

        if (element.nodeName == 'DIV' && element.hasChildNodes())
        {  
           element = element.firstChild;  
        }
        else if (element.nextSibling)
        {  
           element = element.nextSibling;  
        }
        else
        {
          do
          {
            element = element.parentNode;
          }
          while (element && element!=parentElement && !element.nextSibling);

          if (element && element!=parentElement)
          {  
            element = element.nextSibling;  
          }
        }
      }
    }

    // Searches for the passed string.  If there is no parameter, 
    // it takes it from the URL query.
    //
    // Always returns true, since other documents may try to call it 
    // and that may or may not be possible.
    this.Search = function(search)
    {
      if (!search) // get search word from URL
      {
        search = window.location.search;
        search = search.substring(1);  // Remove the leading '?'
        search = unescape(search);
      }

      search = search.replace(/^ +/, ""); // strip leading spaces
      search = search.replace(/ +$/, ""); // strip trailing spaces
      search = search.toLowerCase();
      search = convertToId(search);

      var resultRows = document.getElementsByTagName("div");
      var matches = 0;

      var i = 0;
      while (i < resultRows.length)
      {
        var row = resultRows.item(i);
        if (row.className == "SRResult")
        {
          var rowMatchName = row.id.toLowerCase();
          rowMatchName = rowMatchName.replace(/^sr\d*_/, ''); // strip 'sr123_'

          if (search.length<=rowMatchName.length && 
             rowMatchName.substr(0, search.length)==search)
          {
            row.style.display = "block";
            matches++;
          }
          else
          {  
            row.style.display = "none";  
          }
        }
        i++;
      }
      document.getElementById("Searching").style.display="none";
      if (matches == 0) // no results
      {  
        document.getElementById("NoMatches").style.display="block";  
      }
      else // at least one result
      {  
        document.getElementById("NoMatches").style.display="none";  
      }
      this.lastMatchCount = matches;
      return true;
    }
}