//===============================================
//button state handlers

function overNav(button){
    button.style.backgroundColor = "#dadada";
    button.style.color = "#5d5d5d";
}

function outNav(button){
    button.style.backgroundColor = "#999999";
    button.style.color = "#ffffff";
}

function pressNav(page){
    document.location.href = page;
}

function overSideNav(button){
    button.style.backgroundColor = "#dbdbfa";
    hideFeatured();
}

function outSideNav(button){
    button.style.backgroundColor = "#f0efef";
}

function overTab(button){
    button.style.backgroundColor = "#dbdbfa";
}

function offTab(button){
    button.style.backgroundColor = "#e7e7e7";
}

function overButton(button){
    if(button.className == "button-gray"){
        button.className = "button-gray-over";
    }
    if(button.className == "button-blue"){
        button.className = "button-blue-over";
    }
}

function offButton(button){
    if(button.className == "button-gray-over"){
        button.className = "button-gray";
    }
    if(button.className == "button-blue-over"){
        button.className = "button-blue";
    }  
}

function overAdvancedSearchButton(button){
    button.style.backgroundColor = "#ffffff";
}

function offAdvancedSearchButton(button){
    button.style.backgroundColor = "transparent";
}

function overKey(button){
    button.style.backgroundColor = "#ffffff";
    button.style.border = "1px solid #1d2b5a";
}

function offKey(button){
    button.style.backgroundColor = "transparent";
    button.style.border = "1px solid #ededdc";
}

function overAuthorKey(button){
    button.style.backgroundColor = "#ffffff";
    button.style.border = "1px solid #1d2b5a";
}

function offAuthorKey(button){
    button.style.backgroundColor = "transparent";
    button.style.border = "1px solid #e7e7d0";
}

function swapImage(el,img){
    el.src = img;
}

function swapBackgroundImage(el,img){
    el.style.backgroundImage = 'url("'+ img +'")';
}

function overHomeNav(button){
    button.style.backgroundColor = "#dbdbfa";
}

function offHomeNav(button){
    button.style.backgroundColor = "#ffffff";
}

function overHideShow(button){
    button.style.textDecoration = "underline";
}

function offHideShow(button){
    button.style.textDecoration = "none";
}

//===============================================
//button action handlers

function open_note(inFile) {
    var win = window.open(inFile,"econlib-note","width=400,height=300,scrollable=yes");
}

function openPopup(url){
    //left=50,top=50,screenx=50,screeny=50,
    var newWin=window.open(url, 'popup','width=600,height=540,scrollbars=yes,resizable=yes,toolbar=no,status=no,location=no');
    newWin.focus();
}

function showHidestuff(shID) {    
  if (document.getElementById(shID)) {       
   if (document.getElementById(shID+'-show').style.display != 'none') {          document.getElementById(shID+'-show').style.display = 'none';          document.getElementById(shID).style.display = 'block';       
   }       
   else {          
document.getElementById(shID+'-show').style.display = 'inline';          document.getElementById(shID).style.display = 'none';       
   }    
  } 
} 

function hideHighlights(button, body_id){
    var show="<div class=\"show\" onmouseover=\"overHideShow(this);\" onmouseout=\"offHideShow(this);\" onclick=\"showHighlights(this,'"+ body_id +"')\">SHOW HIGHLIGHTS</div>";
    var parent = button.parentNode;
    parent.innerHTML = show;

    var tbody = document.getElementById(body_id);
    tbody.style.display = "none";
}

function showHighlights(button, body_id){
    var hide="<div class=\"hide\" onmouseover=\"overHideShow(this);\" onmouseout=\"offHideShow(this);\" onclick=\"hideHighlights(this,'"+ body_id +"')\">HIDE HIGHLIGHTS</div>";
    var parent = button.parentNode;
    parent.innerHTML = hide;
    
    var tbody = document.getElementById(body_id);
    tbody.style.display = "";    
}

function hideReadings(button, body_id){
    var show="<div class=\"show\" onmouseover=\"overHideShow(this);\" onmouseout=\"offHideShow(this);\" onclick=\"showReadings(this,'"+ body_id +"')\">SHOW READINGS</div>";
    var parent = button.parentNode;
    parent.innerHTML = show;

    var tbody = document.getElementById(body_id);
    tbody.style.display = "none";
}

function showReadings(button, body_id){
    var hide="<div class=\"hide\" onmouseover=\"overHideShow(this);\" onmouseout=\"offHideShow(this);\" onclick=\"hideReadings(this,'"+ body_id +"')\">HIDE READINGS</div>";
    var parent = button.parentNode;
    parent.innerHTML = hide;
    
    var tbody = document.getElementById(body_id);
    tbody.style.display = "";    
}



var featured_items = null;

function overFeatured(id){
    hideFeatured();
    var el = document.getElementById(id);
    el.style.display = "";
    featured_items = el;
}

function hideFeatured(){
    if(featured_items != null){
        featured_items.style.display = "none";
        featured_items = null;
    }
}

function mailpage()
{
mail_str = "mailto:?subject=Check out this Econlib page";
mail_str += "&body=I thought you might be interested in " + document.title;
mail_str += ". You can view it at " + location.href; 
location.href = mail_str;
}

//===============================================
//search term highlighter

//
// This is the function that actually highlights a text string by
// adding HTML tags before and after all occurrences of the search
// term. You can pass your own tags if you'd like, or if the
// highlightStartTag or highlightEndTag parameters are omitted or
// are empty strings then the default <font> tags will be used.
//
function doHighlight(bodyText, searchTerm, highlightStartTag, highlightEndTag) 
{
  // the highlightStartTag and highlightEndTag parameters are optional
  if ((!highlightStartTag) || (!highlightEndTag)) {
    highlightStartTag = "<font style='background-color:#FAF596;'>";
    highlightEndTag = "</font>";
  }
  
  // find all occurrences of the search term in the given text,
  // and add some "highlight" tags to them (we're not using a
  // regular expression search, because we want to filter out
  // matches that occur within HTML tags and script blocks, so
  // we have to do a little extra validation)
  var newText = "";
  var i = -1;
  var lcSearchTerm = searchTerm.toLowerCase();
  var lcBodyText = bodyText.toLowerCase();
    
  while (bodyText.length > 0) {
    i = lcBodyText.indexOf(lcSearchTerm, i+1);
    if (i < 0) {
      newText += bodyText;
      bodyText = "";
    } else {
      // skip anything inside an HTML tag
      if (bodyText.lastIndexOf(">", i) >= bodyText.lastIndexOf("<", i)) {
        // skip anything inside a <script> block
        if (lcBodyText.lastIndexOf("/script>", i) >= lcBodyText.lastIndexOf("<script", i)) {
          newText += bodyText.substring(0, i) + highlightStartTag + bodyText.substr(i, searchTerm.length) + highlightEndTag;
          bodyText = bodyText.substr(i + searchTerm.length);
          lcBodyText = bodyText.toLowerCase();
          i = -1;
        }
      }
    }
  }
  
  return newText;
}

//
// This is sort of a wrapper function to the doHighlight function.
// It takes the searchText that you pass, optionally splits it into
// separate words, and transforms the text on the current web page.
// Only the "searchText" parameter is required; all other parameters
// are optional and can be omitted.
//
function highlightSearchTerms(searchText, treatAsPhrase, warnOnFailure, highlightStartTag, highlightEndTag)
{
  // if the treatAsPhrase parameter is true, then we should search for 
  // the entire phrase that was entered; otherwise, we will split the
  // search string so that each word is searched for and highlighted
  // individually
  if (treatAsPhrase) {
    searchArray = [searchText];
  } else {
    searchArray = searchText.split(" ");
  }
  //JFC Add - 0503
  var searchArea = document.getElementById("EconlibHighlightArea");  
  if (!searchArea || typeof(searchArea.innerHTML) == "undefined") {
     searchArea = document.body;
  }
  if (!searchArea || typeof(searchArea.innerHTML) == "undefined") {
  //if (!document.body || typeof(document.body.innerHTML) == "undefined") {
    if (warnOnFailure) {
      alert("Sorry, for some reason the text of this page is unavailable. Searching will not work.");
    }
    return false;
  }
  
  var bodyText = searchArea.innerHTML;
  //var bodyText = document.body.innerHTML;
  for (var i = 0; i < searchArray.length; i++) {
    if (searchArray[i] == 'and' || searchArray[i] == 'not' || searchArray[i] == 'near' || searchArray[i] == 'or') {
       var xasx = ''; 
    }
    else {
    bodyText = doHighlight(bodyText, searchArray[i], highlightStartTag, highlightEndTag);
    }
  }
  
  searchArea.innerHTML = bodyText;
  //document.body.innerHTML = bodyText;
  return true;
}

//
// This function takes a referer/referrer string and parses it
// to determine if it contains any search terms. If it does, the
// search terms are passed to the highlightSearchTerms function
// so they can be highlighted on the current page.
//

function highlightEconlibSearchTerms(referrer)
{
  // This function has will work with any incoming query but
  // not with incoming q or p as from google, yahoo, or msn
  // Terms will be automatically highlighted on a page.
  // Call the function in the onload event of the <body> tag, 
  // like this:
  //   <body onload='highlightEconlibSearchTerms(document.referrer);'>
  
  //var referrer = document.referrer;

  if (!referrer) {
    return false;
  }

  var queryPrefix = "query=";
  var startPos = referrer.toLowerCase().indexOf(queryPrefix);
  if ((startPos < 0) || (startPos + queryPrefix.length == referrer.length)) {
    return false;
  }

  //JFC Addition - Display Clear highlights if you get to here
  var btnClearHigh = document.getElementById("btnClearHigh");
  if (btnClearHigh) {
      btnClearHigh.style.display = "";
  }

  var endPos = referrer.indexOf("&", startPos);
  if (endPos < 0) {
    endPos = referrer.length;
  }
  
 
  var queryString = referrer.substring(startPos + queryPrefix.length, endPos);
  // fix the space characters
  queryString = queryString.replace(/\+/gi, " ");
  queryString = queryString.replace(/%20/gi, " ");
  queryString = queryString.replace(/\*/gi, "");
  queryString = queryString.replace(/\+-/gi, "");
  queryString = queryString.replace(/\+/gi, " ");
  // remove the quotes (if you're really creative, you could search for the
  // terms within the quotes as phrases, and everything else as single terms)
  // NEW remove asterisk wildcards
  // NEW remove hyphens that served as NOT, i.e., following space plus sign
  queryString = queryString.replace(/%22/gi, "");
  queryString = queryString.replace(/\"/gi, "");
  queryString = queryString.replace(/^\s+|\s+$/, "");
  return highlightSearchTerms(queryString, false);
}

// clear highlights, works in ie and firefox

function rld() {
document.location=window.location.pathname;
}

// view notes highlighted in books
   function view_note(id) {
      // Change JFC var ctl = document.getElementById('notes_all');

      var ctl = document.getElementById(id).parentNode.parentNode;
      for (var xN = ctl.firstChild; xN; xN = xN.nextSibling) {
//alert(xN.nodeName + ' ' + xN.childNodes.length + ' ');
          if (xN.nodeType==1 && xN.nodeName == 'DIV') {
             var xT = xN.childNodes.item(1);
             if (xT.id == id) {
                 xT.className = 'textSelect';
             }
             else {if (xT.className != 'text') {
                 xT.className = 'text'; 
             }
             }

          }

      }
   }