How to make new field appear ONLY when an option is selected?

[Anonymous]

Hi,

Does anyone know how to do this with country and state?  I want if US is the country, to show the state drop down.

Thanks,
Dianna

[Anonymous]

Link was broken...here it is: http://community.marketo.com/MarketoResource?id=kA650000000GtpdCAC

[Anonymous]

http://community.marketo.com/MarketoDiscussionDetail?id=90650000000PGJKAA4