accessing a DLL function from JavaScript/ASP

[Ted1]

I am not looking for a detailed answer (although that would be above-and-beyond) but a general idea of:

How do I call a C++ DLL (non-registerable) from JavaScript/ASP? I can call it OK from VBScript using "Server.CreateObject" - however I can't figure out how to access the DLL's functions from JavaScript/ASP?