Access Denied when overwriting

[likwid]

Hey guys,

I have a macbook and an iMac at home, both running the latest version of Leopard. I have set up a filesharing network to share my work between the two machines. I am able to open a document on my macbook that is stored on my iMac without any problems. However, after I have this file open, I cannot save any changes that I make to it because I am given the error message, "Access to (name of file here) was denied".

How can I allow overwriting of files on a remote computer like a normal server would allow?

Thanks