iphoto "hides" all its photos so taht you can't move them, because if you move them it fucks all iphoto up. What you need to do is open iphoto, right-click on one of your pictures and select "show in finder" or something like that.
it's going to open a new window with your photo highlighted, and all the other ones in the same directory. Congratulations, you've now entered iphoto's secret, invisible garden. now you can navigate and take all the photos you wnat, but i suggest COPYING them to another place, because if you just move them iphoto wil spend hours trying to find the new file where it previously was and its going to be really fucked up. So there, i hope i helped.