Merging iPhoto 6 libraries with iPhoto 11

I have a MacbookPro running OS10.4.11 with iPhoto 6 and just bought a new iMac with OS10.7.3 with iPhoto 11.

I currently have iPhoto Library Manger v3.73 on both machines. I also have three iPhoto Libraries set up - two libraries are on an external hard drive - "2006-2007" and "2008-2010", and the 3rd library, "2011-2012", is on my laptop.

When I bought the new iMac, the Apple Store geniuses were able to move my 2011-2012 library from my laptop to my iMac. Unfortunately, they refused to merge/move my other two libraries that I have on my external drive.

What I'd like to do is merge all three iPhoto libraries together into one library on my iMac. What is the best way to do this? Please give me step-by-step instructions, I'm a duffus when it comes to 'puters! :)

thank you very much in advance!