The ideal thing to do would be to sync the photos from your laptop to your iPad using iTunes. Your problem, however, is that your laptop and the OS (leopard) are so old, you won't be able to sync your new iPad. You need Snow Leopard (10.6) at least, and I don't know if your powerbook can work with that. You really need to upgrade your laptop, it's OS, or (preferably) both to take full advantage of the iPad technologies.
An alternative that might work is to copy all the photos onto an SD card and use the Camera Connection Kit to load them onto your iPad. The file exensions and folders have to be set exactly right for the iPad to recognize it, but it can be done. Texas Mac Man will likely copy and paste one of his tutorials about this here at some point.