function doHighlight(bodyText, searchTerm, highlightStartTag, highlightEndTag)
{
        // 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 = 0, j = 0;
        var before_c, before_c;
        var lcSearchTerm = searchTerm.toLowerCase();
        var lcBodyText = bodyText.toLowerCase();

        while ((i = lcBodyText.indexOf(lcSearchTerm, i)) > 0) {
                before_c = lcBodyText.charCodeAt(i-1);
                after_c  = lcBodyText.charCodeAt(i+searchTerm.length);
                if (lcBodyText.lastIndexOf(">", i) >= lcBodyText.lastIndexOf("<", i)) {
                        if (lcBodyText.lastIndexOf("/script>", i) >= lcBodyText.lastIndexOf("<script", i)) {
                                if ( (before_c < 65 || before_c > 122) && (after_c < 65 || after_c > 122) ) {
                                        newText += bodyText.substring(j, i) + highlightStartTag + bodyText.sub
str(i, searchTerm.length) + highlightEndTag;
                                        i += searchTerm.length;
                                        j = i;
                                        continue;
                                }
                        }
                }
                i++;
        }
        newText += bodyText.substring(j, bodyText.length);

        return newText;
}