function htmlentities (string, quote_style, charset, double_encode) {
    // http://kevin.vanzonneveld.net
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +    revised by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: nobbler
    // +    tweaked by: Jack
    // +   bugfixed by: Onno Marsman
    // +    revised by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +    bugfixed by: Brett Zamir (http://brett-zamir.me)
    // +      input by: Ratheous
    // +   improved by: Rafał Kukawski (http://blog.kukawski.pl)
    // -    depends on: get_html_translation_table
    // *     example 1: htmlentities('Kevin & van Zonneveld');
    // *     returns 1: 'Kevin & van Zonneveld'
    // *     example 2: htmlentities("foo'bar","ENT_QUOTES");
    // *     returns 2: 'foo'bar'
    var hash_map = {},
        symbol = '',
        entity = '',
        self = this;
    string += '';
    double_encode = !!double_encode || double_encode == null;

    if (false === (hash_map = this.get_html_translation_table('HTML_ENTITIES', quote_style))) {
        return false;
    }
    hash_map["'"] = ''';
    
    if (double_encode) {
        for (symbol in hash_map) {
            entity = hash_map[symbol];
            string = string.split(symbol).join(entity);
        }
    } else {
        string = string.replace(/([\s\S]*?)(&(?:#\d+|#x[\da-f]+|[a-z][\da-z]*);|$)/g, function (ignore, text, entity) {
            return self.htmlentities(text, quote_style, charset) + entity;
        });
    }

    return string;
}