Resetting IDENTITY seed using T-SQL

How do you reset the IDENTITY seed on a column in a table using a T-SQL statement?

My situation is that I've written a stored procedure to copy data from from one table (AccountOld) to another table (AccountNew). I'm using a stored procedure because the data needs to be manipulated along the way.

My problem is the AccountNew table has an IDENTITY index column (AccountID). Everytime I run the stored procedure it begins by deleting all the data from AccountNew then copying the rows from AccountOld. But everytime I run the SP it starts using an Identity value from where it left off after the last Insert. The AccountOld table has a lot of records and I have to run the SP often. The result is the Identity seed has grown very large.

What I want to do is reset the seed on the AccountID column back to 1 before I start inserting the data so that it starts generating the AccountID column from 1 everytime I run the SP.

I can't use TRUNCATE TABLE (OR DROP Column -- ADD Column)because there are foreign keys on the AccountNew table

I can't use the index column from the AccountOld table, the AccountID column on the AccountNew table has to be an Identity value,

I can't use SET IDENTITY_INSERT AccountID ON/OFF because that would require using a cursor in the SP which I don't want to do (and it still doesn't reset the seed)

I can reset the seed by going into Enterprise Manager, removing and recreating the IDENTITY contraints on the column, but I'd rather do it in the SP.