From Overview of JavaScript I -- Basic Web Scripting Language CPS616 Technologies of the Information Age -- Spring Semester 99. byGeoffrey C. Fox (Tom Scavo)
with ( someObject ) { statements }
someObject is the default object used for any unqualified object references: with ( Math ) { area = PI*r*r; // Math property PI x = r*cos(theta); // Math method cos y = r*sin(theta); // Math method sin }