protected function getVersionInfo()
	{
		if(YII_DEBUG)
		{
			$version='<a href="http://www.yiiframework.com/">Yii Framework</a>/'.Yii::getVersion();
			if(isset($_SERVER['SERVER_SOFTWARE']))
				$version=$_SERVER['SERVER_SOFTWARE'].' '.$version;
		}
		else
			$version='';
		return $version;
	}