Validate a field based on another field value

We have a widget with two email fields and want to only let the signer continue if the value of the two fields match.  We're hoping this cuts down on the typos in email addresses.  So the two fields a "Email" and "Confirm Email" but I do see a way to check that the value of "Confirm Email" is equal to "Email."

1. Is there another way to do this?
2. Is my formula just wrong?   Tried: fieldValue=[Email]   ... and    =[Email] ... and     if(fieldValue=[Email],true,false)

Thanks.