What could cause 100% bounce rate with only 12% exit rate in analytics

[JS_Harris]

A category page on one of my sites receives roughly 275 visits a day from Google thanks in part to the addition of some pictures and some "widget history" text appearing at the top, but, somehow the page consistently gets a 100% bounce rate while receiving a 12%-16% exit rate at the same time.

Can clicks on a nofollow link cause this?
Can clicks on a javascript link cause this?

These people aren't leaving the site at a rate of 100% but I'm not sure why that rating is the same every day.

edit: the javascript links are part of a thumbnail image gallery preview feature which is served by javascript.

[edited by: JS_Harris at 7:21 am (utc) on May 13, 2009]

[BradleyT]

The main key is to look at entrances to the page - both in quantity (how many) and quality (where they came from)

Maybe you have a link on a forum because of one of your pictures and the 100% bounce rate is really only from 5 visitors who entered on that page.

Edit - oops didn't see the "from google" part. Hmm, I guess look at your keywords and try and figure out users intent.

[edited by: BradleyT at 6:05 pm (utc) on May 14, 2009]