Combining multiple field entries into one field OR not
I would like to auto-populate a field in Adobe using the first & last names of the people completing the form as per the following:
DETAILS ENTERED BY CLIENTS ON PAGE ONE
FIELD I NEED TO AUTO POPULATE

I am using the following custom calculation script to auto populate "authorisation_1", which works fine when the "firstname2" and "lastname2" fields have been populated:
event.value = getField("firstname1").valueAsString + " " + getField("lastname1").valueAsString + " & " + getField("firstname2").valueAsString + " " + getField("lastname2").valueAsString;
However, my question is, how do i ensure the "&" does not appear in "authorisation_1" field IF nothing has been entered into the "firstname2" and "lastname2" fields?
NEED TO AVOID THIS

Thanks in advance.
