Look into the file /b2evocore/_class_item.php and you will find all parameters for all functions around item.

This particular one :

/**
	 * Template function: list all the category names
	 *
	 * {@internal Item::categories(-) }}
	 *
	 * @param string link title, '#' for default, false if you want no links
	 * @param string string fo display before the MAIN category, 'hide' to ignore main cat
	 * @param string string fo display after the MAIN category, 'hide' to ignore main cat
	 * @param string string fo display before OTHER categories, 'hide' to ignore other cats
	 * @param string string fo display after OTHER categories, 'hide' to ignore other cats
	 * @param string string fo display before EXTERNAL categories, 'hide' to ignore external cats
	 * @param string string fo display after EXTERNAL categories, 'hide' to ignore external cats
	 * @param string separator string
	 * @param string Output format for each cat, see {@link format_to_output()}
	 */

I went to your site. Very nice skin and features in there such as the mail article to, and comments, etc.

is this sharable?

Nice Job...

mail article to is a work done by Scott (stk - http://randsco.com) and is explained on his website...