/*
		 * 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 = "<div style='display:inline;color:#523600;background-color:#fdeabb;'>";
			highlightEndTag = "</div>";
		  }
		  
		  // 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(" ");
		  }
		  
		  
		  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;
		}