public function addDailyHtml( $html, $start_date_string, $end_date_string = null ) {
		static $htmlCount = 0;
		$start_date = strtotime($start_date_string);
		if( $end_date_string ) {
			$end_date = strtotime($end_date_string);
		} else {
			$end_date = $start_date;
		}

		$working_date = $start_date;
		do {
			$tDate        = getdate($working_date);
			$working_date += 86400;

			$this->dailyHtml[$tDate['year']][$tDate['mon']][$tDate['mday']][$htmlCount] = $html;
		} while( $working_date < $end_date + 1 );

		$htmlCount++;
	}