[guytje]

Well, I don't think that's true, because:

http://www.posters-affiches.com/shop/customer/search.php?substring=

works fine

But

http://www.posters-affiches.com/shop/customer/search.php?PHPSESSID=c1aacfb728c5a2d87fd7428bc66fa 12b&substring=

Doesn't yield any results!

Any idea?
Me