You can remove that Web.config attribute safely.  Using the ResourcePath improves performance mostly for postback heavy web applications.  If you're not posting back all that much there isn't much of a difference.

They are located in:

C:\Program Files\Atalasoft\DotImage 5.0\C# Source\VS 03\DotImageWebFormsCS\Resources (for .NET 1.1 C#)C:\Program Files\Atalasoft\DotImage 5.0\C# Source\VS 05\DotImageWebFormsCS\Resources (for .NET 2.0 C#)