[NextGen Gallery] Big Galeries

HI Guys

I’m using next gen gallery. Everthing works fine so far. But i changed my Design now from Tables to DIV & CSS. Now the nextgen gallery has some “problems”.

Can someone tell my why it look like this:
https://www.sumit-online.de/sumit/v10/?page_id=15
and how can i fix it?

And a problem that also was there before i worked with div & css was this:
https://www.sumit-online.de/sumit/v10/?page_id=15&album=1&gallery=2
Sometimes there is some space between Pictures. I want to fix this also

greetings and sorry if its hard to understand my english

Sumit