/*
 * 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 Highlight()
{
	urlquery=location.href.split("?");

  if (urlquery[1])
    searchArray = urlquery[1].split(",");
  else
    return false;
  
  if (!document.body || typeof(document.body.innerHTML) == "undefined")
    return false;
  
  var bodyText = document.body.innerHTML;
  for (var i = 0; i < searchArray.length; i++)
  {
	var backColors = new Array('#ffff66','#a0ffff','#99ff99','#ff9999','#cccc66','#ccff66','#99ccff','#ffccff','#ffffcc','white');
	if( i > 8 )
		backColorsIndexNr = 8;
	else
		backColorsIndexNr = i;
		
	bodyText = doHighlight(bodyText, searchArray[i], backColors[backColorsIndexNr]);
  }
  
  document.body.innerHTML = bodyText;
  return true;
}

function doHighlight(bodyText, searchTerm, backColor) 
{
  highlightStartTag = "<span style='background-color:"+backColor+";'>";
  highlightEndTag = "</span>";
  
  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;
}


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