[TYPO3-english] Custom Javascript in View->List forms

[Guillermo R. Oramas J.]

Sorry if this is a repetitive question, but I couldn't find any concrete
information about this.

I have a table, I configured the TCA, and now I need to display some alerts
when the users select some options in one of the fields. Also I need to
change a conditional selector (state) depending on the option of other
selector (country), so the question is How can I add Javascript code to do
this, without breaking the code or my brain?

Thank you for any clear piece of advice.

Guillermo O.