class MyHTMLParser(HTMLParser):
    def __init__(self, text, preserve=None):
        HTMLParser.__init__(self)
        self.stack = []
        self.preserve = preserve
        if preserve is None:
            self.preserve = []
        elif isinstance(preserve, basestring):
            self.preserve = [preserve]

    def handle_starttag(self, tag, attrs):
        if tag.lower() in self.preserve:
            self.stack.append( self.__html_start_tag(tag, attrs) )

    def handle_endtag(self, tag):
        if tag.lower() in self.preserve:
            self.stack.append( self.__html_end_tag(tag) )

    def handle_startendtag(self, tag, attrs):
        if tag.lower() in self.preserve:
            self.stack.append( self.__html_startend_tag(tag, attrs) )

    def handle_data(self, data):
        self.stack.append(data)

    def __html_start_tag(self, tag, attrs):
        return '<%s%s>' % (tag, self.__html_attrs(attrs))

    def __html_startend_tag(self, tag, attrs):
        return '<%s%s/>' % (tag, self.__html_attrs(attrs))

    def __html_end_tag(self, tag):
        return '</%s>' % (tag,)

    def __html_attrs(self, attrs):
        _attrs = ''
        if attrs:
            _attrs = ' %s' % (' '.join(['%s="%s"' % (item[0],item[1]) for item in attrs]))
        return _attrs

    @classmethod
    def parse(cls, text, preserve=None):
        _p = cls(text, preserve)
        _p.feed(text)
        _p.close()
        return "".join(_p.stack)