function user_password($username,$password){
        if ($username==NULL){ return (false); }
        if ($password==NULL){ return (false); }
        if (!$this->_bind){ return (false); }
        if (!$this->_use_ssl){ echo ("FATAL: SSL must be configured on your webserver and enabled in the class to set passwords."); exit(); }
        
        $user=$this->user_info($username,array("cn"));
        if ($user[0]["dn"]==NULL){ return (false); }
        $user_dn=$user[0]["dn"];
                
        $add=array();
        $add["unicodePwd"][0]=$this->encode_password($password);
        
        $result=ldap_mod_replace($this->_conn,$user_dn,$add);
        if ($result==false){ return (false); }
        
        return (true);
    }