Entering Data, Spreadsheet-style

I would like to know if and how it would be possible to create an
entry-screen that allows the user to enter data in a database, using a
spreadsheet/table-like entry screen. The screen would start of having
headers for each column/field and an empty row underneath. When each column
in the row is filled in, the user must have an option to add another row.

I'm look for the code/explanation that helps me set up the entry screen, and
the ASP code to add the entered data in the database.

I can imagine that each entered row is added to the table when a new row is
added, or a button is pressed and then the screen refreshes with the newly
entered information and a new row...