iPhoto question

Hi, probably really easy but i can't understand what i've done here!!

When i open iPhoto it takes up the whole screen, i can't see any desktop behind it, i could before and i think i just pressed the maximise, but now it's either maximised or minimised and not in between if that makes sense??

What am i missing?

You can grab the bottom right hand corner of the window and make it the size you want
as with most windows.

Ah got it... Thanks for that!!