I dunno...I personally think that the member detail pages are already kind of cluttered...if a person wanted to go through all the members, it'd be pretty easy to just open links in a new window or tab. >

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Also, it would slow down the detail pages(although not by much), because one other query would be performed in order to get the next ID. Also, there's no telling as to whether the user would expect the next member that fits the criteria they selected on the members' rides page, the next member who has a Celica, the next member who has a Celica and photos, the next member regardless of Celica-owning status or not, etc. >

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