/* http://www.kryogenix.org/code/browser/searchhi/ */
/* Modified 20021006 to fix query string parsing and add case insensitivity */
/* Modified 20070316 to stop highlighting inside nosearchhi nodes */
function highlightWord(node,word) {
  // Iterate into this nodes childNodes
  if (node.hasChildNodes)
  {
    var hi_cn;
    for (hi_cn=0;hi_cn<node.childNodes.length;hi_cn++)
    {
      highlightWord(node.childNodes[hi_cn],word);
    }
  }
  
  // And do this node itself
  if (node.nodeType == 3) { // text node
    tempNodeVal = node.nodeValue.toLowerCase();
    tempWordVal = word.toLowerCase();
    if (tempNodeVal.indexOf(tempWordVal) != -1)
    {
      pn = node.parentNode;
      // check if we're inside a "nosearchhi" zone
      checkn = pn;
      while (checkn.nodeType != 9 && 
      checkn.nodeName.toLowerCase() != 'body') { 
      // 9 = top of doc
        if (checkn.className.match(/\bnosearchhi\b/)) { return; }
        checkn = checkn.parentNode;
      }
      if (pn.className != "searchword")
      {
        // word has not already been highlighted!
        nv = node.nodeValue;
        ni = tempNodeVal.indexOf(tempWordVal);
        // Create a load of replacement nodes
        before = document.createTextNode(nv.substr(0,ni));
        docWordVal = nv.substr(ni,word.length);
        after = document.createTextNode(nv.substr(ni+word.length));
        hiwordtext = document.createTextNode(docWordVal);
        hiword = document.createElement("span");
        hiword.className = "searchword";
        hiword.appendChild(hiwordtext);
        pn.insertBefore(before,node);
        pn.insertBefore(hiword,node);
        pn.insertBefore(after,node);
        pn.removeChild(node);
      }
    }
  }
}

function getURLParam(strParamName){
  var strReturn = "";
  var strHref = window.location.href;
  if ( strHref.indexOf("?") > -1 ){
    var strQueryString = strHref.substr(strHref.indexOf("?")).toLowerCase();
    var aQueryString = strQueryString.split("&");
    for ( var iParam = 0; iParam < aQueryString.length; iParam++ ){
      if (
aQueryString[iParam].indexOf(strParamName.toLowerCase() + "=") > -1 ){
        var aParam = aQueryString[iParam].split("=");
        strReturn = aParam[1];
        break;
      }
    }
  }
  return unescape(strReturn);
}

function googleSearchHighlight() {
  if (getURLParam("highlight") == ""
      || getURLParam("highlight") == "false"
      || getURLParam("highlight") == "0"
      || getURLParam("highlight") == "no") return;
  if (!document.createElement) return;
  ref = getURLParam("q");
  if (ref == "") ref = getURLParam("p");
  if (ref == "")
  {
    ref = document.referrer;
    if (ref.indexOf('?') == -1) return;
    qs = ref.substr(ref.indexOf('?')+1);
  }
  else
    qs = "q=" + ref;


  var msgnode = document.createTextNode(
        "The following search terms have been highlighted: ");

  var list = document.createElement("div");

  list.className = "notice";

  list.appendChild(msgnode);

  qsa = qs.split('&');

  for (i=0;i<qsa.length;i++)
  {
    qsip = qsa[i].split('=');
    if (qsip.length == 1) continue;
    if (qsip[0] == 'q' || qsip[0] == 'p') { // q= for Google, p= for Yahoo
      words = unescape(qsip[1].replace(/\+/g,' ')).split(/\s+/);
      for (w=0;w<words.length;w++)
      {
        highlightWord(document.getElementsByTagName("body")[0],words[w]);

        var tmpnode = document.createElement("span");
        tmpnode.appendChild(document.createTextNode(words[w]));
        tmpnode.className = "searchword";
        list.appendChild(document.createTextNode(w > 0 ? ", " : ""));
        list.appendChild(tmpnode);
      }
    }
  }
  var node = document.getElementById("contents");
  
  var child1 = node.firstChild;
  node.insertBefore(list, node.firstChild);
  //var cloned = child1.cloneNode(true);
  //var div = document.createElement("<div>");
  //var text = document.createTextNode("The following search terms have been highlighted: ");
  //div.appendChild(text);
  //div.appendChild(list);
  //div.className = 'notice';
  //newone.syle.color = blue;
  //newone.setAttribute("class", "notice";
  //newone.setAttribute("className", "notice";
  //node.replaceChild(child1, newone);
}

window.onload = googleSearchHighlight;