Desktop Application to Web Application

I have a desktop application and my client need this software to be import as a Web Application instead of a Desktop. Does anyone has any experience to do this? I can send you the software installation in CD so that you can follow everything on it. The application is for small banking system. The software it self, it's very basic. Anyone whos familiar with banking system, please bid. If you can show some sample of your work similiar with this project, that will be preferable.