protected function renderPercentage( $ratio )
	{
		if( !$this->getOption( 'usePercentage' ) )
			return "";
		$value		= floor( $ratio * 100 )."&nbsp;%";
		$attributes	= array( 'class' => $this->getOption( 'classPercentage' ) );
		$div		= UI_HTML_Tag::create( "span", $value, $attributes );
		return $div;
	}