function nusoap_client($endpoint,$wsdl = false,$proxyhost = false,$proxyport = false,$proxyusername = false, $proxypassword = false, $timeout = 0, $response_timeout = 30, $portName = ''){
        parent::nusoap_base();
        $this->endpoint = $endpoint;
        $this->proxyhost = $proxyhost;
        $this->proxyport = $proxyport;