http://cgi.ebay.com/ws/eBayISAPI.dll...tem=2029866753
You can see the vents clearly in that one.
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=2029904251
In the back middle of this one you can sort of see the fan.
You could just get a cooling pad however, but it's better if there are vents or a fan that blows out.