Dual Validation rules on one field

Hello all,

I am trying to create a field that has multiple validation. I'm trying to create a field that would allow either an FIEN or a Social Security Number. I tried using the validation property for EIN and SS Number, but it did not work.

Is there a way to create a script that would allow either an FIEN or SS #?

Also, on required fields, how do you display a message, clear the field value and force focus on the field if it is invalid?

Thank you!

Rick