Shooting projectiles once per second.

I am trying to get my game to "shoot" a projectile out from the location of an empty object. As of now it shoots every two seconds BUT it shoots a ton at once.

Here is my code for shooting.

function Shoot(seconds) { if(seconds!=savedTime) { var bullet : GameObject = Instantiate(bulletPrefab ,transform.Find("projRelease").transform.position ,Quaternion.identity);

     bullet.rigidbody.AddForce(transform.forward * 1000);

     savedTime=seconds;
 }

}

And here is the part for seconds.

function Update () { if(LookAtTarget) { var rotate = Quaternion.LookRotation(LookAtTarget.position - transform.position);

     transform.rotation = Quaternion.Slerp(transform.rotation, rotate, Time.deltaTime * damp);   

     var seconds : int = Time.time;
     var oddeven = (seconds % 2);

 if(oddeven)
 {
     Shoot(seconds);
 }

 }

}

I am also getting this error.

Invalid Cast Exception : Cannot cast from source type to destination type.

Thanks in advance :)