'Browse categories.
cat (category ID) and ctr (subcategory ID) are used as filters.'

def browse(self, cat=None, ctr=None):

    path = 'browse?c=3'
    if (cat != None):
        path += ('&cat=%s' % requests.utils.quote(cat))
    if (ctr != None):
        path += ('&ctr=%s' % requests.utils.quote(ctr))
    message = self.executeRequestApi2(path)
    return message.payload.browseResponse
