Php photo gallery

1

If you check on this site http://www.theredwalls.com/photos.aspyou will see a couple of photo gallery’s if you click on then you will have a popup window with the images and you can go to the next and the previous.I was trying to check out how it is made by viewing the source and copying the files out of my temporary files but i cant get it to work.the first gallery had 4 pictures every images has his own php file but they all have the same name on the redwalls server when i copy them to my computer it will overwright them so that i have 1 php file and not 4.Can somebody tell how i can get this done or maby someone knows a page with the correct scripts.Thanks in advance