Heat oven to 350°F. Grease 13x9-inch pan. In small saucepan over low heat, melt chocolate and 1/2 cup margarine, stirring constantly until smooth. Remove from heat; cool 10 minutes or until slightly cooled.
In medium bowl, combine sugar, vanilla and eggs; beat until light and fluffy. Add flour, salt and chocolate mixture; blend well. Spread in greased pan.
Bake at 350°F. for 30 to 38 minutes. DO NOT OVERBAKE. Cool 1 hour or until completely cooled.
In small saucepan, melt glaze ingredients over low heat, stirring constantly until smooth. Drizzle glaze over cooled brownies. Let stand until set. Cut into bars.