Programmatically turn off gravity on rigidbody

I would like to turn off gravity after a specific event in my Unity game. Is there a way to turn off gravity programmatically?

thanks

use .useGravity

example

// Disables gravity on all rigid bodies entering this collider.
function OnTriggerEnter (other : Collider)
{
    if (other.attachedRigidbody)
    {
        other.attachedRigidbody.useGravity = false;
    }
}
// Turn this collider into a trigger on startup
collider.isTrigger = true;

In said event you would want to set the useGravity property of the rigidBody to false.

http://unity3d.com/support/documentation/ScriptReference/Rigidbody.html