Unity help with OnTrigger Enter gravity turn off

Hey guys and girls,

Simply enough I'm having a little trouble with this part of a script, as simply enough I don't quite understand javascript just yet. What i'm trying to do is OnTriggerEnter I want the gravity applied to this object via its rigidbody to be tunred on... however it's not quite there.

 function OnTriggerEnter(otherObject: Collider){
     if(otherObject.gameObject.tag == "switch1"){
     var block1 = GameObject.FindWithTag ("block1");
     block1.attachedRigidbody.useGravity = true;
     }
     }

Any ideas would be lovely.

Thanks!