You can make a folder on your computer, then add your photos into this folder, plug in iPad, open iTunes and set the photo destination to the photo folder. And then sync your iPad with iTunes, that's all.
Or you can use this iPad file manager (http://www.ipod-transfer-copy.com/ipod-iphone-to-computer-transfer-cucusoft.html
) to upload the photos from computer to your ipad 2.