/*
 *
 * Copyright 2005 Comergent Technologies. All Rights Reserved.
 *
 */

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>";
  }
  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
      j = bodyText.lastIndexOf('>', i);
      k = bodyText.lastIndexOf('<', i);
      if (j >= k)
      {
        // skip anything inside a <script> block
        m = lcBodyText.lastIndexOf('/script>', i);
        n = lcBodyText.lastIndexOf('<script>', i);
        if (m >= n)
        {
          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;
}

function highlightSearchTerms(booleanHighlight, searchText, treatAsPhrase, warnOnFailure, highlightStartTag, highlightEndTag)
{
  if (booleanHighlight)
  {
  	//alert('booleanHighlight is true');
	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;
  }
  else
  {
  	//alert('booleanHighlight is false');  
  }
  return true;
}