Newbie Form Help?

[zrweber]

Ok on my page (index.php) I have 3 numbers.

1.
2.
3.

I want people to be able to fill out a form then depending on what number they select they're name will be on that number..

So like if someone choosed option 2 on the form and their name was Bob it'd look like this

1.
2. Bob
3.

Then someone else signs it and chooses option 1 and their name is John

1. John
2. Bob
   3.

How would I do this? Also how can I make it to where people cannot choose the same number? So if 1 is taken people cannot choose it.

Thanks