var previousBodyText = null;
var n = 0;
var prevSearch = "";

String.prototype.trim = function () {
    return this.replace(/^\s*/, "").replace(/\s*$/, "");
}

/*
 * 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, textNotFound) 
{
  // the highlightStartTag and highlightEndTag parameters are optional
  if ((!highlightStartTag) || (!highlightEndTag)) {
    highlightStartTag = "<a name='findHighlighted'><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();
  var found = false;
  
  while (bodyText.length > 0) {
    i = lcBodyText.indexOf(lcSearchTerm, i+1);
    if (i < 0) {
      newText += bodyText;
      bodyText = "";
      
    } else {
    	found = true;
      // 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;
        }
      }
    }
  }
  if (!found){
  newText = '<B><font style="color:red;">' + textNotFound + '</font></B>' + newText;
  }
  return newText;
}

/**
 *  find the given string in the text
 */
function findInText(el, str, treatAsPhrase, replacePreviousBodyText, textNotFound) {
  var txt, i, found;
  
  /*if(prevSearch != str) {
	n = 0;
	prevSearch = str;	  
  }*/
  
  if (str == "")
    return false;

  highlightSearchTerms(el, str, treatAsPhrase, replacePreviousBodyText, textNotFound);
  
  /*  txt = window.document.body.createTextRange();
    for (i = 0; i <= n && (found = txt.findText(str)) != false; i++)
    {
      txt.moveStart("character", 1);
      txt.moveEnd("textedit");
    }
    
    if (found)    {
      txt.moveStart("character", -1);
      txt.findText(str);
      txt.select();
      txt.scrollIntoView();
      n++;
    }
    else    {
      if (n > 0) {
        n = 0;
        findInPage(el, str);
      }
      else alert("Not found.");
    }*/
    
  return false;
}


/*
 * 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(bodyText, searchText, treatAsPhrase, replacePreviousBodyText, textNotFound)
{
  if (searchText == null || searchText == 'undefined' || searchText.trim() == '') {
  	if (previousBodyText != null && replacePreviousBodyText == true) {
  		bodyText.innerHTML = previousBodyText;
  	}
  	return false;
  }

  // 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(!bodyText || typeof(bodyText) == "undefined") {
  	alert("Sorry, for some reason the text of this page is unavailable. Searching will not work.");
  	return false;
  }  
  
  var text = bodyText.innerHTML;
  if(replacePreviousBodyText == true) {
	  if (previousBodyText != null) {
  		bodyText.innerHTML = previousBodyText;
	  }
  
	  text = bodyText.innerHTML;
	  previousBodyText = bodyText.innerHTML;
  }
  
  for (var i = 0; i < searchArray.length; i++) {
    text = doHighlight(text, searchArray[i], '<a name="findHighlighted"><font style="background-color: #FFFF00;">','</font>', textNotFound);
  }
  
  bodyText.innerHTML = text;
  
  return true;
}