Add Domain users to multiple machines / Read info from text file

I am using the batch file below, to add 30 domain users to the administrators group of 30 machines. I would
really like it though if I could make the batch file read from a text file that will list the domain user names
and the machine names, instead of having to add these names in the batch file manually.

Help?

Thanks

set machineuser=
set machinepass=
set domainfull=
set domainsmall=

set domainuser001=
set domainuser002=
set domainuser003=
set domainuser004=
set domainuser005=
set domainuser006=
set domainuser007=
set domainuser008=
set domainuser009=
set domainuser010=
set domainuser011=
set domainuser012=
set domainuser013=
set domainuser014=
set domainuser015=
set domainuser016=
set domainuser017=