Have you tried look at the profiler session of the parameters being passed in? Also - have you made sure that there is in fact only ONE stored proc with that specific name (e.g. myuser.StoredProc and dbo.StoredProc)? If the ASP is using a specific user account it might not be using the default schema.
On profiler: start a session recording, then fire your ASP call at it - you should be able to see what it being passed in.
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Your lack of planning does not constitute an emergency on my part...unless you're my manager...or a director and above...or a really loud-spoken end-user..All right - what was my emergency again?