Could you please (pretty please with suger on top) post smaller pics? Here's a real nice image hosting service that will resize your image and not make your post impossible to read or view.
Postimage.org So easy an Englishman could do it.
So you have a crack in your coolant reservoir. Believe it or not, this has been discussed on Rennlist and all the Pelican affiliated forums. Wayne Dempsey did a nice write up with pictures you can actually see and it's available on the Pelican site. Wayne's book 101 Projects on the Porsche Boxster is well worth the 20 quid you'd pay for it, btw.
Dammit, those huge images are a pain in the arse! Here's the link to Mr. Dempsey's write up.
https://www.pelicanparts.com/techarticles/Boxster_Tech/33-WATER-Coolant_Tank/33-WATER-Coolant_Tank.htm
Cheers!