Подскажите почему этот скрипт ищет только латинские буквы и цифры, что надо исправить чтоб русские тож искал?

// These are the available "error strings" you can change them to affect the output
// of the search engine.
ERR_NoOptions = "You didn't specify where to search for your keywords, please try again.";
ERR_NoSearchTerms = "You didn't enter any words to search for, please enter some words to search for and try again.";
ERR_NoResults = "Your search found no results, try less specific terms.";

// Performs an actual search and then returns the index number(s) in the db array
// where it found this element.
// keywords = the string they searched for (each space-separated word
// is searched for separately)
// options can be
// 1 = search keywords, not description, not heading
// 2 = search keywords, search description, not heading
// 3 = search all
function performSearch(keywords, options) {
// Determine where to check for the keywords entered
if (options == 0) {
return ERR_NoOptions;
}
else if (options == 1) {
searchKeywords = true;
searchDescription = false;
searchHeading = false;
}
else if (options == 2) {
searchKeywords = true;
searchDescription = true;
searchHeading = false;
}
else if (options == 3) {
searchKeywords = true;
searchDescription = true;
searchHeading = true;
}

// Check to make sure they entered some search terms
if (!keywords || keywords.length == 0) {
return ERR_NoSearchTerms;
}

// Setting up the keywords array for searching
// Remove common punctuation
keywords = keywords.replace("\.,'", "");

// get them all into an array so we can loop thru them
// we assume a space was used to separate the terms
searchFor = keywords.split(" ");

// This is where we will be putting the results.
results = new Array();

// Loop through the db for potential results
// For every entry in the "database"
for (sDB = 0; sDB < searchDB.length; sDB++) {
// For every search term we are working with
for (t = 0; t < searchFor.length; t++) {
// Check in the heading for the term if required
if (searchHeading) {
if (searchDB[sDB].heading.toLowerCase().indexOf(searchFor[t].toLowerCase()) != -1) {
if (!in_array(String(sDB), results)) {
results[results.length] = String(sDB);
}
}
}

// Check in the keywords for the term if required
if (searchKeywords) {
if (searchDB[sDB].terms.toLowerCase().indexOf(searchFor[t].toLowerCase()) != -1) {
if (!in_array(String(sDB), results)) {
results[results.length] = String(sDB);
}
}
}

// Check in the description for the term if required
if (searchDescription) {
if (searchDB[sDB].description.toLowerCase().indexOf(searchFor[t].toLowerCase()) != -1) {
if (!in_array(String(sDB), results)) {
results[results.length] = String(sDB);
}
}
}
}
}

if (results.length > 0) {
return results;
}
else {
return ERR_NoResults;
}
}

// Constructor for each search engine item.
// Used to create a record in the searchable "database"
function searchOption(heading, terms, description, url) {
this.heading = heading;
this.terms = terms;
this.description = description;
this.url = url;
return this;
}

// Returns true or false based on whether the specified string is found
// in the array.
// This is based on the PHP function of the same name.
// stringToSearch = the string to look for
// arrayToSearch = the array to look for the string in.
function in_array(stringToSearch, arrayToSearch) {
for (s = 0; s < arrayToSearch.length; s++) {
if (arrayToSearch[s].indexOf(stringToSearch) != -1) {
return true;
exit;
}
}
return false;
}

// This function grabs a specified value from a GET-style URL
// you call it with the name of the variable and it returns
// the value, or false if not found.
function getURLvalue(getName) {
var i, pos, argname, argvalue, queryString, pairs;

// get the string following the question mark
queryString = location.href.substring(location.href.indexOf("?")+1);

// split parameters into pairs, assuming pairs are separated by ampersands
pairs = queryString.split("&");

// for each pair, we get the name and the value
for (i = 0; i < pairs.length; i++) {
pos = pairs[i].indexOf('=');
if (pos == -1) {
continue;
}
argname = pairs[i].substring(0,pos);
argvalue = pairs[i].substring(pos+1);

// Replaces "Google-style" + signs with the spaces
// they represent
if (argname == getName) {
return unescape(argvalue.replace(/\+/g, " "));
}
}
return false;
}

// Function to execute when the focus is passed to the search filed.
// It just selects everything in the field, which will mean that if
// the user clicks the search field then types, the placeholder text
// will be removed automagically
// call using onFocus="java script:searchFocus(this);
function searchFocus(searchField) {
searchField.focus();
searchField.select();
}

http://strongweb.narod.ru/JSSearch/index.html - пример работы скрипта если надо, ну кто нибудь неполенитесь, помогите. буду очень признателен