I'm not an ASP expert at all, but in SQL, I think you need commas after each item you set the value of. For instance:
Set NewCust = db.execute ("INSERT INTO custtable Set " &_
"fname = 'FirstName'," &_
"lname = 'LastName'," &_
"email = 'EmailAddress'," &_
"address1 = 'Any Address'," &_...