[Javascript] Select Box or Radio which will automatically make more of same

[javascript@xxxxxxxxxx (javascript@xxxxxxxxxx)]

I am looking for a script I saw once which allowed a user to select a choice, either by a select box or radio button, and their selection would make more boxes=2E=
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My example would be:=20

"How many dogs do you own?"=20
If they choose "3" , by select or radio, then it would make three select boxes (in each box I would have a breed of dog selection)=2E=
=20

Any ideas on how I could find this script again?=20

Thank you!