Collision Help

I am trying to get my missile and enemy ship to collide and delete each other, but no nluck. I am also using the shoots behaviour. My code is in my enemy.cs file. Can'e see what im doing wrong, please help!

function EnemyShip::onCollision( %this, %srcObj, %dstObj, %srcRef, %dstRef, %time, %normal, %contactCount, %contacts )
{
if (%dstObj.class $= "pMissile") {
%srcObj.safeDelete();
%dstObj.safeDelete();
}
}