function doHighlight(bodyText, searchTerm, highlightStartTag, highlightEndTag) 
{
   // the highlightStartTag and highlightEndTag parameters are optional
   if ((!highlightStartTag) || (!highlightEndTag)) {
      highlightStartTag = "<font style='color:blue; background-color:yellow;'>";
      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 = $('result').innerHTML;
   for (var i = 0; i < searchArray.length; i++) {
      bodyText = doHighlight(bodyText, searchArray[i], highlightStartTag, highlightEndTag);
   }
//   document.body.innerHTML = bodyText;
   $('result').innerHTML = bodyText;
   return true;
}