SQL Server 2000

I want to do this:

Doc....Date........IN....OUT.....Balance

001..01/01/2001...1200..............1200

002..01/01/2001...........300........800

003..01/01/2001...........400........400

004..01/01/2001....150...............550

I want to get the Balance Column directly from a SQL Sentence.

I'm working in a SQL Server 2000.

Is this possible?

I will appreciate any help.

Tank You