Pictures on network hard drive

[forumjoe]

Forgive me for the newbie question, but I have seen some hard drives at Best Buy that say hey are compatible with iPad.
If I already have a standard network drive on my home network that is accessible to my PC, is there an app that can query my home network (and my drive) much in the same way that I use my PC to find my network drive.
My network drive is attached to my router with the an Ethernet connection.
Thanks in advance for any ideas.