public static function addFontStyle($styleName, $styleFont, $styleParagraph = null) {
		if(!array_key_exists($styleName, self::$_styleElements)) {
			$font = new PHPWord_Style_Font('text', $styleParagraph);
			foreach($styleFont as $key => $value) {
				if(substr($key, 0, 1) != '_') {
					$key = '_'.$key;
				}
				$font->setStyleValue($key, $value);
			}
			self::$_styleElements[$styleName] = $font;
		}
	}