I am not sure but you can try something like that...

First, try to find the name of fields (userid and password)...
loField=goWeb.document.all
if type('loField.length')="N"
for lnI=0 to loField.length-1
?loField.item(lnI).name
endfor
endif

Second, send value (userid and password) to both fields...
loField.item(?).value=userid
loField.item(?).value=password
* where ? is the corresponding lnI

Third, tell me if it works.