public function __construct($sTumblrID = null,$sHTTPUserAgent = 'phpTumblr') {
		if ($sTumblrID == null) { unset($this); return false; }

		$this->sTumblrID = $sTumblrID;
		$sTumblrURL = $sTumblrID.'.tumblr.com';
		
		$oNetHttp = &$this->oNetHttp;
		$oNetHttp = new netHttp($sTumblrURL);
		$oNetHttp->setUserAgent($sHTTPUserAgent);
		$oNetHttp->get('/');
		if ($oNetHttp->getStatus() != 200) { unset($this); return false; }
		
		$this->__getTumblelogInfos();
		
		return true;
	}