Why do you want to eliminate IN? It's usually more efficient than an equivalent join.
If srno in IFDetails is nullable, you may want to use EXISTS instead. Also your first predicate is not SARGable, so that may result in the query being a little slower than it could be.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability