Add line to page based upon selection from drop-down box

[Dean]

I'm trying to work on a page that will add a new table row to an existing
table based upon a selection from a drop down box. The box will have 3 selections;
Select, Single-User, Multi-User. Only if the user selects Multi-User should
the new table row display.

Any ideas on how I can do this?

Thanks,

Dean