var win = this;
var IE4 = (document.all);

/*
 * 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 = "<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(" ");
  } */

  searchArray = new Array();

  var inquote = false;
  var buf = "";
  for (i = 0; i < searchText.length; i++) {
     
     var c = searchText.charAt(i);
     
     switch(c) {
        case "'":
           if (inquote) {
              searchArray.push(buf);
              buf = "";
              inquote = false;
           } else {
              inquote = true;
           }
           
           break;
        case " ":
           if (!inquote) {
              if (buf.length > 0) {
                 searchArray.push(buf);
              }
              buf = "";
              break;
           }
        default:
           buf = buf + c;
     }
  }
  if (buf.length > 0) {
     searchArray.push(buf);
  }
  
  
  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;
//  if(searchArray.length > 0)
//  {
//     var browserName=navigator.appName; 
//     
//     if (browserName=="Netscape")
//     {
//        win.find(searchArray[0]);
//     }
//     
//     if (browserName=="Microsoft Internet Explorer")
//     {
//        var txt;
//        txt = document.body.createTextRange();
//        txt.findText(searchArray[0]);
//        txt.scrollIntoView();
//     }
//  }
  
  for (var i = 0; i < searchArray.length; i++) {
     bodyText = doHighlight(bodyText, searchArray[i], highlightStartTag, highlightEndTag);
  }
  
  document.body.innerHTML = bodyText;
  return true;
}


function searchPrompt()
{
   alert("Hey There");
   searchPrompt("Type Here", true, "white", "blue");
}

/*
 * This displays a dialog box that allows a user to enter their own
 * search terms to highlight on the page, and then passes the search
 * text or phrase to the highlightSearchTerms function. All parameters
 * are optional.
 */
function searchPrompt(defaultText, treatAsPhrase, textColor, bgColor)
{
  // This function prompts the user for any words that should
  // be highlighted on this web page
  if (!defaultText) {
    defaultText = "";
  }
  
  // we can optionally use our own highlight tag values
  if ((!textColor) || (!bgColor)) {
    highlightStartTag = "";
    highlightEndTag = "";
  } else {
    highlightStartTag = "<font style='color:" + textColor + "; background-color:" + bgColor + ";'>";
    highlightEndTag = "</font>";
  }
  
  if (treatAsPhrase) {
    promptText = "Please enter the phrase you'd like to search for:";
  } else {
    promptText = "Please enter the words you'd like to search for, separated by spaces:";
  }
  
  searchText = getURLParam("term");
  
  if (!searchText)  {
    //alert("No search terms were entered. Exiting function.");
    return false;
  }
  
  while(searchText.indexOf("%20") != -1)
  {
     searchText = searchText.replace("%20", " ");
  }

  while(searchText.indexOf("%22") != -1)
  {
     searchText = searchText.replace("%22", "'");
  }
  
  //alert("searchtext: " + searchText);
     //prompt(promptText, defaultText);
  
  return highlightSearchTerms(searchText, treatAsPhrase, true, highlightStartTag, highlightEndTag);
}


function getURLParam(strParamName)
{
   var strReturn = "";
   var strHref = window.location.href;
   if ( strHref.indexOf("&") > -1 )
   {
      var strQueryString = strHref.substr(strHref.indexOf("&")).toLowerCase();
      var aQueryString = strQueryString.split("&");
      for ( var iParam = 0; iParam < aQueryString.length; iParam++ )
      {
         if ( aQueryString[iParam].indexOf(strParamName + "=") > -1 )
         {
            var aParam = aQueryString[iParam].split("=");
            strReturn = aParam[1];
            break;
         }
      }
   }
   return strReturn;
}