Open iTunes. Sync your iPad. When its done syncing, click on the iPad symbol on the list on the left side of the screen on the column. Next, note above, several tabs; information, Music, Movies, etc. Also up there is Photos, I think the last tab. On that, you can select to Sync with a specific folder on your hard drive. On mine, I create a folder in my Photos main folder. I called it iPod Photos. In there, I also have sub folders I organized my photos by, thus my Photos folder for iPod is huge and tons of folders for all my organized photos, so when I sync my device, I can then update all that is on the device. I do this with the iPhone as well.
If you have a Mac, you can use iPhoto. I havent learn to sync that way yet. If you do not have a Mac computer you are syncing with, then you need to go with the Folder route.
Also, when you add photos to your iPad, they will auto-sync to your Photos folder on your computer, (when you set it up with a folder and activate syncing Photos).
Hope that helps.
