Passing user credintials from a web page to a web service.

I'm sure this is easy and I'll be embarrassed when I see the answer, but I just can't figure this one out.
Using .Net/ASP 1.1 on a server using integrated authentication--
I have a web page (.aspx) that will collect some data from the user, call a web service to get additional data, and then merge and format the data back to the user's browser. But I want the web service to authenticate with the user's credentials, not the credentials of IIS serving the aspx page. What the web service will or will not return is based on who is making the request.
How do I pass the user's credentials to the web service?

Sample code, white paper, knowledge base article, any clue will be welcome. Thanks in advance.

Dan
.

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