// Redirect Page into WHELP Frame
if (top.location.href == location.href) {
  document.writeln("<meta http-equiv=\"refresh\" content=\"0; URL=http:\/\/" + location.host +"\/wiki\/whelp\/KaD\/index.php?ld=" + location.href + "\">");
}


function getQueryVariable(variable) {

  var query = window.location.search.substring(1);

  var vars = query.split("&");

  for (var i=0;i<vars.length;i++) {

    var pair = vars[i].split("=");

    if (pair[0] == variable) {

      return pair[1];

    }

  } 

  return '';

}





function doHighlight(bodyText, searchTerm, highlightStartTag, highlightEndTag) 

{

  // the highlightStartTag and highlightEndTag parameters are optional

  if ((!highlightStartTag) || (!highlightEndTag)) {

    highlightStartTag = "<font style='color:#335577; background-color:#d3ed7d;'>";

    highlightEndTag = "</font>";

  }

  

  // find all occurences 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(" ");

  }

  

  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 = document.body.innerHTML;

  for (var i = 0; i < searchArray.length; i++) {

    bodyText = doHighlight(bodyText, searchArray[i], highlightStartTag, highlightEndTag);

  }

  

  document.body.innerHTML = bodyText;

  return true;

}





function doProc()

{

  query = parent.toolbar.document.getElementById('search').value;

  if(query.length > 2) {

    highlightSearchTerms(query);

  }

}



/*

 * This displays a dialog box that allows a user to enter their own

 * search terms to highlight on the page, and then passes the search

 * text or phrase to the highlightSearchTerms function. All parameters

 * are optional.

 */

function searchPrompt(defaultText, treatAsPhrase, textColor, bgColor)

{

  // This function prompts the user for any words that should

  // be highlighted on this web page

  if (!defaultText) {

    defaultText = "";

  }

  

  // we can optionally use our own highlight tag values

  if ((!textColor) || (!bgColor)) {

    highlightStartTag = "";

    highlightEndTag = "";

  } else {

    highlightStartTag = "<font style='color:" + textColor + "; background-color:" + bgColor + ";'>";

    highlightEndTag = "</font>";

  }

  

  if (treatAsPhrase) {

    promptText = "Please enter the phrase you'd like to search for:";

  } else {

    promptText = "Please enter the words you'd like to search for, separated by spaces:";

  }

  

  searchText = prompt(promptText, defaultText);



  if (!searchText)  {

    alert("No search terms were entered. Exiting function.");

    return false;

  }

  

  return highlightSearchTerms(searchText, treatAsPhrase, true, highlightStartTag, highlightEndTag);

}





/*

 * 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 highlightGoogleSearchTerms(referrer)

{

  // This function has only been very lightly tested against

  // typical Google search URLs. If you wanted the Google search

  // terms to be automatically highlighted on a page, you could

  // call the function in the onload event of your <body> tag, 

  // like this:

  //   <body onload='highlightGoogleSearchTerms(document.referrer);'>

  

  //var referrer = document.referrer;

  if (!referrer) {

    return false;

  }

  

  var queryPrefix = "q=";

  var startPos = referrer.toLowerCase().indexOf(queryPrefix);

  if ((startPos < 0) || (startPos + queryPrefix.length == referrer.length)) {

    return false;

  }

  

  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(/%20/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)

  queryString = queryString.replace(/%22/gi, "");

  queryString = queryString.replace(/\"/gi, "");

  

  return highlightSearchTerms(queryString, false);

}





/*

 * This function is just an easy way to test the highlightGoogleSearchTerms

 * function.

 */

function testHighlightGoogleSearchTerms()

{

  var referrerString = "http://www.google.com/search?q=javascript%20highlight&amp;start=0";

  referrerString = prompt("Test the following referrer string:", referrerString);

  return highlightGoogleSearchTerms(referrerString);

}