I'll trust that you've just copied that CSS in there to show us, and are using <style> tags or an external style sheet.
Confused as what you are trying to do. Any chance of a link to your page?
Presuming that you want the thumbnail to link to the actual image, this is what I would do.
From the complexity of your code though, I'd guess you're trying to do something more complex then that. What do you want to happen?
<a href="/images/101.jpg"><img src="images/101.jpg" alt="" title="" width="10%" height="10%" /></a><br />
(If you can't give us a link, any chance you can post the rest of your CSS...I've got no idea what the <em> and <span> tags are doing in the mix at the moment...)