I don't think you can do it directly, though you may be able to create a VB component that will do the job. Are you going to keep the site on Win 98? as if you plan to move to NT/2000 with IIS, it is pronbably not worth the effort.
Have a look at this article<BR>http://www.asptoday.com/articles/20000417.htm<BR><BR>It gives info on how to use NT security to validate your users, which I assume is what you are after. If you are trying to capture the users name & password, I would think that that would not be possible as it is a security risk.