How to remove Identity Specification for Multiple tables at once in SQL Server 2008

I am having total 109 table in Database and now i am migrating to amazon server with identity insert and now i want to remove auto increment column specification for all tables. How set auto increment column i.e Identity specification to no in SQL server 2008 for all tables.

For Example

I am having

CREATE TABLE dbo.tbl_acc
    (
    a1     NUMERIC (18) IDENTITY NOT NULL,
    a2     NUMERIC (18) NULL,
    a3     VARCHAR (4000) NULL,
    a4     VARCHAR (3999) NULL,

    CONSTRAINT PK_tbl_acc PRIMARY KEY (a1)
    )
GO

And now i would like to remove IDENTITY. Not only for this remaining all tables.