Kutije - WA

I'm getting 5/10 WAs. Can someone tell me is my idea good ( and has some minor bug ) or I must use another approach.

http://www.z-trening.com/new/www/html/submit.php?submit=7100050289&subm_code=1

Thank you, I have overlooked that.

Hvala ti, prevideo sam to da ubacujem i te kutije koje sam vec ubacio. ;)