How do I get the pictures off my iPhone to iPhoto?

Well, I have a Macbook, OSX Snow Leapord. Awhile ago I used iPhoto to put pictures on my iPhone. Thus removing my photos form my computer. A while ago I moved iPhoto library to an external hard drive to make space, and now I've moved it back. However, when I open iPhoto, it still tells me I have no pictures. I think I may have created anotherfile or something that iPhoto is going to pull from, which is empty, or somethign like that. I also have the pictures on my iPhone if that can help me, but whenever I use like iphoto or the image grabber for Macs it just takes off the pictures I took with my camera on my phone. Thanks in advance for the help, and for not telling me to just go "Buy a PC" as it is not only obnoxious, but also fails to solve the problem.