from afar-

EZboard only allows either .gif or .jpeg extensions....exe is a program, and also it is doubtful the website host would allow that to be put up. Because it is a program, you could threoretically upload a virus in your mainframe host, and then transfer it to ezboard.

as for size, you can add how ever may images you want, but take care that they are small or else the page will take forever to load.

you can add a table in the description so that the images are side by side.

otherwise if you just put img src=website, then you will have your pics in a vertical alignment...

ie:
pic one
pic two
pic three

if you do a table than you could do:
pic one pic two pic three