Ms Sql Equivalent Of This Oracle

Hi.
I'm a casual sql user. I have found a situation where I need to convert an
oracle statement to tsql, one I can just fire off in any sql tool against an
ms sql server database.

I studied the exists statement and I think I understand it somewhat, however I
was not sure how to get it quite right. If you have an idea and a minute or
two I'd appreciate any insight or tutorial.

insert into authorization (program, optiontitle, usergroup, authorizationid)
select 'EVERYWHERE','NAVIGATOR',usergroup, authorizationseq.nextval
from allgroups where exists (select * from authorization
where authorization.USERGROUP = allgroups.USERGROUP and
authorization.optiontitle = 'READ' and authorization.program = 'EVERYWHERE')



I believe that because in my data, three values of usergroup from allgroups
return true from the exists, that this is supposed to insert three rows into
authorization.

But I can't figure out what to do about the authorization.nextval.. I tried
various max(authorization)+1
etc but nothing seemed to compile/work

thanks
Jeff Kish