This is a complicated subject, but the short answer is no, there is no simple way to do this.
Your options:
1. Use Visual Interdev to recreate the user interface and port all the code to server-side and client-side script. VERY NON TRIVIAL.
2. Create a Web project in Visual Basic. When you choose new project, select IIS Application as the type. Then create the user interface using the WebClass designer. This is probably still a long process. I haven't worked with web projects in VB, but I know the debugging is much easier than in Visual Interdev. Once you compile you have ASP pages and a DLL as your compiled code.
You'll need to read up on both of these to see which one will work better for you. I think one of the main goals for VB.NET will be to make this sort of transition easier, but until we see it, I guess we won't know how much easier it will be.
Good luck.