Need help to identify homepage layout

Hello!

Can anyone tell me how the portfolio part of this website is made?
http://www.marioklemm.​com/german/portfolio.p​hp
Looks like a 500px portfolio?

Looks to me like a basic php. page with a bunch of photos embedded on it. It can be done with html too.

But how do you make the custom sizes on the thumbnails? I don't know anything about php so this might be a stupid question!?

Not a dumb question. We are all here to learn. A website forum may be the place to ask if you don't get a good answer on here. There's probably lots of ways to do it. I haven't used dream weaver in years, but last I knew you could format with tables to make your rows and include text boxes and embedd the image in the box and move around as you wish. I think the text box is probably how they got the different size jpg.